Monday, September 21, 2009

Do yoga and pilates count?

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Q It's said that you should do at least three sessions of exercise a week that get you out of breath - but what about yoga and pilates? Don't they count?

A My grandparents, who lived into their 90s, walked every day, stretched, did the gardening and plenty of DIY, and played gentle tennis. Increasingly, evidence appears to support our intuition that sitting for prolonged periods is harmful to our health. Worldwide recommendations have moved from three vigorous workouts to at least 150 minutes of moderately intense activity a week, incurred over most days. Now 300 minutes of activity are considered desirable. In other words, 30-60 minutes, five days a week, which can consist of simply getting up and about, gym work, pilates, sport, cycling, walking to work, taking the stairs, gardening and playing with the kids.

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While yoga and pilates are suitable for all ages, the type, duration and intensity of exercise should be tailored to the individual. Younger age groups can consider more intense exercise and manual labour, while the elderly and obese should look at gentler regimes; osteoporosis-risk groups, such as middle-aged women, can use impact training to help bone strength.

Either way, the message is simple. The Japanese model of activity before work, such as yoga, has undoubted benefits. As a society we need to make exercise part of everyday activities. So Brown, Obama et al, build those bike paths and make exercise at the workplace compulsory ... before we get too big to get off the couch.

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Can you have your metabolism measured?

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Q: People talk about fast and slow metabolisms - but can you have your metabolism measured? And what connection does the speed of your metabolism have to your weight?

People talk about fast and slow metabolisms - but can you have your metabolism measured? And what connection does the speed of your metabolism have to your weight?

A: We all require a basic number of calories every day to maintain essential bodily functions - keeping awake, breathing, digesting food. This is referred to as our basic metabolic rate and in the average person is in the region of 1,600 calories a day, about 60% of your daily requirements.

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In obese people there is no inherent absence of this metabolism. But there may be differences in how people increase their metabolism. In over-feeding studies, obese individuals do not seem to increase their energy expenditure, unlike their thin counterparts, through movements such as fidgeting, or even reading. Efficient metabolism may also be explained by greater muscle mass, which uses nearly eight times as many calories at rest, and a low-fat diet that requires more energy to digest.

So can your metabolic rate be assessed by your GP? Unfortunately not, as it requires specialist equipment. But you should not need measurements, or medication, to increase your resting calorie efficiency. Simply put down that remote and finish reading the rest of the papers. Try a press-up to build up your muscle mass and think about adding complex carbohydrates to your diet. Intense but safe exercise also helps activate your nervous system for several hours afterwards. An by all means have a little fidget or two.

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How can I avoid having to go to the toilet when I'm running?

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Q: I have started to run longer distances - to the point that I am now having to think about toilet breaks. What is the best way to stop yourself from needing to go when you are out for a couple of hours?

A: It is not uncommon for entire running clubs to disappear into the bushes when out for longer runs (famously, Paula Radcliffe had no bushes to hide in). This experience of loose, sometimes urgent bowel motions during or immediately after a longer run is known as runners' diarrhoea or "dumping syndrome" and as many as 50% of long-distance runners feel the urge.

There are various theories about this phenomenon. Hormones released by the constant "jiggling" of running may cause the bowel to speed up. And prolonged exercise diverts blood from the bowel to the legs, delaying absorption and causing fluid to build.

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Some simple strategies may help. The most important is not to change your routine on race day. On the day before avoid overloading with high-fibre foods such as rice, bran, beans and fruit. If you are not used to them, shun artificial sweeteners, high-fat foods and energy bars, as all may fire things up. In the hours before a race, make time for ablutions and perhaps omit solid food. Dehydration and overheating can also promote diarrhoea so regular fluid with only 4-8% carbohydrate at 30mls per hour fluid is key.

If none of this works, medications such as loperamide an hour before a race may help. However, they may also interfere with sweating so use with caution in hot weather. If the problems are severe consult your doctor as exercise can bring conditions such as irritable bowel syndrome and lactose intolerance to light. It is rare not to be able to sort out the problem so don't stop running.

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Wednesday, September 16, 2009

Group boxing classes deliver a one-two punch for fitness

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It has been almost 30 years since Maggie Rajnic lost her leg in a motorcycle accident. Since that time, she's tried to stay competitive, not allowing her disability to alter her life.



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But for years Rajnic has been looking for a way to improve her strength and endurance. Four months ago she found it at the LA Boxing gym in Rockville, Maryland.

Designed to teach responsible and injury-free boxing, the gym offers group sessions in the sport, which is much like an aerobics class but with punch.

Combining boxing, kickboxing and a mixture of martial arts, class participants use bags, jump ropes, weight machines and funky music to get fit. Although the gym offers one-on-one sparring as well, the gym's manager, Felix Pagan, said many members choose to battle a bag in group class.

For Rajnic, the class was everything she had been looking for. Not only did she lose 25 pounds and inches from her waist, but she also gained the confidence to participate in a marathon -- something she never thought she'd do. She credits it to boxing. "It creates agility where I don't have the agility or the mobility [because] of a missing limb," she said. She added that the program has helped her develop "a fitness component to my body that I've never been able to achieve before."

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Monday, September 14, 2009

Why Speedos are still huge in France

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Alton Towers in Britain has banned Speedos. In France, meanwhile, they're still virtually compulsory

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Speedos on the beach Photograph: blickwinkel/Alamy

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So Alton Towers has banned embarrassingly titchy swimming trunks at its water park. But spare a thought for France, where the opposite is true: local authorities regularly force men to ditch their Bermudas and parade in skin-tight budgie-smugglers for the greater public good.

In French public pools, from the racing lanes of Paris to the open-air lidos and water parks of the south, anything bigger than Speedos is banned and you must hoist yourself into a posing pouch as a civic requirement. French changing rooms are littered with the broken dreams of prudish males abroad who thought they could sneak in a few lengths without showing their contours.

One Paris-based Irish journalist recalls how he attempted some early-morning back-stroke in a pair of standard Marks & Spencer navy swim shorts that came "about halfway down my thighs". As he lowered himself into the shallow end, the pool attendant screamed that his oversized attire was outlawed. "I said they were being ridiculous and glided into the middle of the pool. A lifeguard jumped into the water after me, three other attendants fetched a big hook for fishing out drowning people and hauled me in. I had to come back in an unbelievably skimpy pair that were somehow acceptable, but bloody uncomfortable for me and anyone who had to look at them."

Why the enforced parading of Frenchmen's bulges? "Hygiene," says Emmanuel Dormois, a head pool attendant in Paris's 11th arrondissement. "Small, tight trunks can only be used for swimming. Bermudas or bigger swimming shorts can be worn elsewhere all day, so could bring in sand, dust or other matter, disturbing the water quality. By banning them outright, we're not forced to stand there measuring what can be defined as swimming shorts. I accept that some men feel very ill at ease wearing small trunks, but others don't mind."

Similar reports of enforced Speedos come from traumatised English visitors to a Belgian water park where bigger swimming shorts were also banned.

Yet on the comparative freedom of French beaches men's crack-splitting tangas and tight nylon slips have gone out of fashion. The smallest tasteful covering is what French stylists call the "boxer" trunk, tight, Daniel Craig-style mini-shorts that look less like ladies' knickers. Not that public pool rules are never challenged. A feminist group has staged topless protests for the right of women to wear only bikini bottoms in line with men. Others argue that if bald men have to wear swimming hats how come others don't have to shave off their beards? And so the debate continues.

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Sunday, September 13, 2009

Do you need to lose weight?

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Losing even modest amounts of weight can help to alleviate many symptoms and reduce your risk of diseases related to being overweight.

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Why a healthy weight is important

If your BMI or waist circumference is above the healthy range you're at increased risk of diabetes, cardiovascular disease and certain cancers such as colon, prostate and breast cancer.

You're also more likely to experience joint problems and back pain, and may find you become breathless and have difficulty sleeping.

The more weight you gain, the more severe these problems may become.

How to lose weight

Losing weight depends on energy balance. If you consume more energy from food and drink than you burn through maintaining your body's functions (metabolism) and physical activity, you'll gain weight.

Cutting calories by reducing how much you eat and drink, and increasing how much physical activity you do will make you lose weight.

If you reduce your daily energy intake to around 500 calories (kcal) below your energy requirements, you'll lose about 0.5kg (1lb) a week. This is a sensible rate of weight loss.

Are you ready to lose weight?

Before you start making changes to your lifestyle, it's important to ask yourself if this is the right time. Are you motivated to change?

The reasons you decide to lose weight will be personal to you. You might find you're more successful if you choose a relatively calm time in your life to start. Conversely, changes in your circumstances, such as a new job or house move, may be the key to your weight loss success.

Whatever you decide, make sure you're feeling positive and ready for the challenge.

Setting realistic goals

To lose weight - and keep it off - you'll need to make permanent changes to your diet and physical activity patterns.

Think carefully about your daily routine. Keeping a food diary may help you to identify patterns in your eating behaviour. This will help you to decide on realistic changes you need to make.

Set achievable goals and try to make modifications to your existing diet and how active you are. Drastic lifestyle changes will be difficult to maintain over time.

Aim to lose about five to ten per cent of your initial body weight over a few months. Research shows this kind of weight loss is achievable and will improve your health.

Once you've reached your goal, congratulate yourself and set another five per cent weight loss target.

This way, you'll feel good about achieving small steps, rather than getting down because it's taking you so long to lose a large amount of weight.

Sticking with it

You may lose more weight in some weeks than in others, but as long as your weight continues to decrease overall there's no need to worry.

If your weight stays the same for a week or two, don't abandon all you've achieved. Instead, focus on the amount and type of food you're eating and try to be a little more active.

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What's a healthy weight?

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Good health is about more than just your weight. It depends on many things, including your family's medical history, your genes, whether you smoke, the type of food you eat and how active you are.
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A combination of factors determines our weight, and that's why it's difficult to set an exact ideal weight that applies to everyone.

It's important to remember there's a range of healthy body weights. Aiming to keep within this means an end to aspiring to one magic weight you think you should be.

Many people have a distorted perception of what constitutes a healthy body weight. We're surrounded by images of celebrities, many of whom are underweight. Comparing yourself with these images isn't helpful. But comparing yourself to friends and family isn't that useful either, because as obesity becomes more common our perception of 'average' weight may in fact be too heavy.

It's important to make an objective assessment of your size. Looking at yourself in the mirror isn't a good way to assess whether you're a healthy weight.

How do I know if I'm a healthy weight?

There are a number of ways you can work out if you're within a healthy weight range. You need to get an accurate idea because it's easy to underestimate or overestimate your own weight.

Body mass index

You can check your body size using the body mass index (BMI), which assesses your weight in relation to your height.

Work out your BMI with our calculator, available in both metric and imperial versions.

Waist circumference

Another method of assessing whether you're a healthy weight is to measure your waist.

This gives an indication of how much fat is stored around your middle. Excess fat in this area increases your risk of heart disease and diabetes.

Body fat

You can measure the amount of fat in your body using scales designed for this purpose, often called body fat analysers. These pass a small, safe electrical signal through your body.

Lean tissue, such as muscle, and blood contain water and act as conductors of the electrical signal, while fat resists it. The greater the resistance, the more body fat you have.

Body fat is only one aspect of health.

Your GP can advise whether additional measurements such as blood pressure, resting heart rate, blood cholesterol, and fat and glucose tests are necessary.

Are you overweight?

If your BMI and waist circumference indicate you're overweight, changes to your lifestyle could help to control your weight. Think about how you can make changes to your diet and physical activity over the long term.


Are you underweight?

Not weighing enough can also put your health at risk. If you're underweight because of a restriction of your diet, you're at risk of a number of nutritional deficiencies.

Young women especially are at risk of anaemia (a lack of iron), while insufficient calcium can lead to osteoporosis in later life. Amenorrhoea (missing menstrual periods) is also common among women who are underweight, and it can lead to infertility.


Are you a healthy weight but unhappy?

If your weight lies within the healthy range but you're unhappy with your shape, you'll probably derive more benefits from a supervised exercise programme than by restricting your diet.

This will improve your fitness, help to tone specific muscle groups and enhance your overall health and wellbeing.

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Saturday, September 12, 2009

Losing a pound a week, staying positive

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Not everyone wishes others well in fulfilling their New Year's resolutions.

Giyen Kim has gone from 190 to 186 pounds in four weeks. A doctor says that's "very reasonable."

Giyen Kim has gone from 190 to 186 pounds in four weeks. A doctor says that's "very reasonable."

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On a video that Giyen Kim recently posted on iReport.com about her frustration with trying to lose weight, one user commented, "Who cares how much you have lost you are still a fat a**. Stop eating and go to the gym."

In the past, Kim might have cried and turned to a pint of ice cream for comfort, she reflected. But this time, she hit the gym -- a reaction she views as a revelation.

"I think that when you are doing what you need to be doing, things like that don't matter," she said. See Kim talk about losing weight

Kim, 34, is one of many CNN readers who are using CNN's iReport.com to share frequent updates of progress on their New Year's resolutions. iReport.com: Share your journey to change

Kim started out at 190 pounds on January 1 with the intention of losing about a pound or two a week throughout the year.

Lately she has been cooking more for herself and trying to stay away from foods that have refined carbohydrates. She also tries to eat one vegan meal every day, but still occasionally indulges in bacon, the namesake for her blog Bacon is My Enemy.

She exercises six days a week, mostly cardio, but wants to work on strength training and resistance training. She would also like to take step classes.

o far she's shed four pounds in four weeks, but the pace feels slow compared with her diet regimens in the past, she said. She found that those extreme diet plans were not realistic options in the long run for maintaining a comfortable weight.

Still, Kim maintains a positive outlook on her situation.

"No matter if you get derailed, if you just pick yourself up again and get back on track, it makes a big difference," she said. "If you're in a place of feeling good about yourself, regardless of how your self-image has been in the past, it propels you to go forward."

Dr. Melina Jampolis, a physician nutrition specialist from San Francisco, California, said losing a pound per week is very reasonable. At most, Kim could probably lose an additional half-pound to pound a week, "but any more than that and she would probably be losing water weight and muscle," Jampolis said.

Jampolis recommends that Kim keep a daily journal of what she eats, and review it to see where she might be able to cut 50 to 100 calories, and where there might be hidden calories in her diet. Kim should also make sure she is varying the intensity, duration, and type of workout, Jampolis said.

"As she loses weight and becomes more fit, she is burning fewer calories doing the same thing, so it is critical to change things up," Jampolis said.

But generally Kim's current pace is great -- "At that rate, she will be down another 20 pounds by summer!" Jampolis said.

As far as Kim's professional goals, she has secured an interim position at a non-profit organization, and continues to do video blogs for Momversation.com.

The market for freelance writers is tough, particularly with many newspapers struggling, she said. Still, Kim is optimistic about following her dream to become a writer.

"I'm not optimistic about our economic future as a country, but as far as me and my journey to find happiness, and accomplish some of these goals that I've had -- weight loss and following my writing passion -- absolutely, I'm still really positive about it," she said.

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Insulin may thwart low-fat diet

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If your body produces too much insulin, you may be more susceptible to weight gain on a conventional low-fat diet.

If your body produces too much insulin, you may be more susceptible to weight gain on a conventional low-fat diet.

Overview

There may be a physiological reason why some people do well on low-fat diets while others fail and it's not a lack of willpower. This research was published in the Journal of the American Medical Association in May 2007.

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Questions and answers

What did this study find?

Dr. Sanjay Gupta, CNN chief medical correspondent: It's a question a lot of us ask: Why do some people succeed on a low-fat diet while others fail miserably? It has nothing to do with willpower or motivation. A study in the Journal of the American Medical Association says that your body's biology may hold the explanation: If your body produces too much insulin, you may be more susceptible to weight gain on a conventional low-fat diet.

What is insulin and what does it have to do with weight gain?

Gupta: Insulin is a hormone that lowers blood sugar and it also tells the body to store fat. It metabolizes carbohydrates and tells the body to store fuel. High-carbohydrate meals can bring spikes in insulin levels, pushing your body into hyper-fuel-storage mode, causing extreme hunger, overeating and weight gain. This cycle of hunger and spiking insulin can make it challenging to keep weight off even with a low-fat diet. But people who were put on a low-glycemic-index diet could overcome that cycle of hunger and weight gain. And they lost more than twice as much weight as people who didn't have the problem with spiking insulin levels.

What is a low glycemic index diet?

Gupta: Seventy-three participants were randomly assigned to one of two diets: low fat or low glycemic index. The two diets, at first glance, aren't extremely different, but the distinctions between them are important. The low-fat diet focuses on whole grains, low fat, veggies and fruits and contains 55 percent carbohydrates and 20 percent fat.

The low-glycemic-index diet has a similar focus on fruits, vegetables and whole grains, but adds nuts, seeds and healthful oils such as olive and canola oil. The percentage of carbohydrates is lower, at 45 percent, and fat is higher at 35 percent. After six months, people on the low-glycemic diet lost twice as much weight as people on the low-fat diet. After 18 months, almost 13 pounds were lost on the low-glycemic-index diet, compared with only 2.6 pounds on the low-fat diet. That's a huge difference.

What are some foods that make sense if you have this tendency to produce too much insulin?

Gupta: The key is to make healthier food selections. Instead of eating foods that digest quickly, like potatoes, white bread and pasta, you want to eat foods that digest slowly: soybeans, oatmeal, broccoli, whole grain breads and some types of fruit.

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Obese children, teens have the arteries of 45-year-olds

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Obese children have as much plaque in their neck arteries as middle-aged adults, according to a study presented this week at the American Heart Association meeting in New Orleans.

According to the CDC, an estimated 17.6 percent of U.S. adolescents are considered obese.

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This precocious buildup of fatty deposits may give kids a looming risk of heart disease and other health problems that are beyond their years too.

"My premonition is that we will see more premature angina and strokes and such," says study author Geetha Raghuveer, M.D., an associate professor of pediatrics at the University of Missouri Kansas City School of Medicine.

In the study, Dr. Raghuveer and colleagues used ultrasound to measure the plaque in the carotid arteries of 70 obese children and teens with an average age of 13. (The study participants were 6 to 19 years of age.) The researchers measured the carotid artery intima-media thickness (CIMT) in the neck and found that the average CIMT was 0.45 millimeters, which is typical of adults in their mid-40s.

The researchers were not surprised that the children had narrowing of their arteries. "We have known that the carotid artery's inner lining is thickened in children with some combination of the traditional risk factors: high cholesterol, obesity, hypertension, insulin resistance, diabetes, even exposure to tobacco smoking," says Dr. Raghuveer.

But finding 30 years' worth of extra fatty buildup exposes the seriousness of the problem, she says. Clogged arteries can increase the risk of stroke and heart attack. Surprising heart attack triggers

"Saying that a child has the arteries of a 45-year-old brings it home, and so I think it's a really nice way to catch people's eye," agrees Sarah De Ferranti, M.D., director of the Preventative Cardiology Clinic at Children's Hospital Boston, Massachusetts.

She applauds the idea of counting children's vascular age, or the state of their arteries, if it helps spur action against the ongoing epidemic of childhood obesity. "I think people are worried, but it's worried-sitting-on-the-couch versus worried-getting-up-and-doing-something."

Public health campaigns that try to get kids to exercise and eat healthier haven't made much of a dent in the problem of childhood obesity, Dr. Raghuveer says; they also haven't cut the rates of heart disease, diabetes, and other health problems that often go along with obesity.

"This study is another red flag to people out there who are managing these kids, and to parents especially," says Dr. Raghuveer. "These kids not only have the risk factors -- like high cholesterol and hypertension -- but they also have damage to their arteries."

That leaves parents and health-care professionals in charge of finding dietary and fitness solutions that work for individual children, she says. In some cases, it may even be necessary to use cholesterol-lowering statins and blood pressure medications. All the children in the study had some kind of abnormality such as elevated total cholesterol, LDL or bad cholesterol, or triglycerides. Which statin will lower your cholesterol?

"Some of these children may need [drugs] either because they're not compliant to dietary changes or because they don't respond," says Dr. Raghuveer.

Health Library

  • MayoClinic.com: Childhood obesity
  • MayoClinic.com: Make weight loss a family affair

There's been some controversy lately about the wisdom of prescribing statins to young children. In July 2008, the American Academy of Pediatrics caused a firestorm when it revised its guidelines to say that statins were appropriate for use in some youngsters with high cholesterol. But most doctors agree that obese children with multiple risk factors might benefit.

Dr. Raghuveer's hope is that CIMT might help doctors decide with greater precision which children might need extreme interventions, a scenario that interests Dr. De Ferranti as well. How stress can trigger heart problems

"You can imagine in the future that someone would measure cholesterol and do one of these tests and decide, that is a child who might be right for statins," says Dr. De Ferranti. "So we can treat the really high risk and focus on lifestyle issues for the rest of the children.

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How does the Atkins diet measure up against others?

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The Atkins diet, which advocates steering away from carbs, may not lead to long-term weight loss.

The Atkins diet, which advocates steering away from carbs, may not lead to long-term weight loss.


Overview

A Stanford University study, released in May 2007 in the Journal of the American Medical Association, compares the effectiveness of four popular diets -- Atkins, LEARN (Lifestyle, Exercise, Attitudes, Relationships, and Nutrition), Ornish, and Zone -- for women who are premenopausal and overweight or obese. Women on Atkins lost the most weight, although the average loss was only about 10 pounds for 12 months.

Questions and answers

What's the best diet?

Dr. Sanjay Gupta, CNN chief medical correspondent: It's always difficult to know which diet is right for you. Researchers at Stanford University looked at four popular diets: Atkins, LEARN, Ornish, and the Zone diet. Three hundred overweight or obese premenopausal women were randomly assigned to these four diets, which they followed for a year. Women in the Atkins group lost the most weight -- about 10 pounds in a year. It's also interesting to note that more participants stayed on the Atkins diet for the entire year, compared with women on the other diets.

But even though these women lost weight, isn't the whole issue about Atkins that it's high in fats that can raise your cholesterol, which might eventually lead to heart problems?

Gupta: Researchers also looked at the good and bad cholesterol and blood pressure of each participant. Atkins patients had a few points higher number for their LDL or bad cholesterol, but overall there was no significant difference. And the Atkins patients had a higher blood pressure number but, again, not that much higher.

What about for the long term? Can they keep the weight off with Atkins?

Gupta: First off, although any doctor will tell you it's good for most people to lose 10 pounds, 10 pounds is not a significant amount of weight to lose in one year. The study does not follow the patients after the year, so you don't know whether they gained their weight back, or whether they lost more. Also, other nutritionists we talked to who have worked on this same type of research said that the only real difference in diets was between Atkins and the Zone. All the others had pretty much the same results. And they found while Atkins can be an effective way to lose weight, few people are able to maintain meaningful long-term weight loss on this diet.

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Fasting carries risk of overeating

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The temptation to eat a lot during Ramadan, the Muslim holy month of fasting, is great, but Saiful Khandker makes a conscious effort to not overdo it.

It is traditional to eat dates on Eid al Fitr, the breaking of the month-long fast of Ramadan.

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It is traditional to eat dates on Eid al Fitr, the breaking of the month-long fast of Ramadan.

"You just kind of have to be mindful of, OK, if I weren't fasting and starving, what kind of meal would I have? And then kind of limit yourself based on that," said Khandker, technology systems director for a hedge fund in New York.

Around the world, many observant Muslims like Khandker who've been fasting all day during Ramadan are thinking about the feast they'll have on Eid al Fitr, the holiday that ends the holy month, next weekend. Khandker describes this day as the Muslim equivalent of Christmas, complete with gift exchanges for children and a lot of food -- everyone can "pig out for the whole day."

Food experts agree that the fast, during which observant Muslims refrain from eating during the day, can actually cause people to overeat. Some people actually take in more calories in one evening meal than they normally would over the course of a normal day during Ramadan, said Joe Regenstein, professor of food science at Cornell University in Ithaca, New York.

"Ironically, there are table manner rules in Islam, and they actually normally encourage you to leave the table partly hungry, which is consistent with modern health guidelines," he said.

This is one of many quirks about religious dietary practices. While no specific regimen of the major religions is better or worse than any other, it is important to keep certain health issues in mind when following those rituals, experts say.

"My general take is that you can have good diets and bad diets in any of the religious systems," Regenstein said.

Here is a sampling of dietary practices carried out in major religions today, and what you should know about them

Fasting

Religious eating habits are especially relevant this month with Muslims observing Ramadan and Jews about to undertake an approximately 24-hour fast on Yom Kippur, which begins at sundown on September 27.

Overeating can harm the body and cause heartburn, cautioned Keri Gans, a registered dietitian in private practice in New York. If you are fasting, you should eat normal sized, well-balanced meals with plenty of liquids to avoid dehydration before a day without eating, she said.

Some people should generally not undertake fasts for health reasons, including pregnant or breastfeeding women and small children, Gans said. If you have an underlying condition such as diabetes, you should talk to your physician about whether you should fast.

As a part of a religion, fasting teaches discipline, Regenstein said.

"The discipline, at least in principle, should help a person eat better," he said.

Meat laws

Kosher meat in Judaism is slaughtered in a specific way by a religious butcher known as a "shochet." The animal is drained of blood and broiled or heavily salted to help remove the blood. Both Judaism and Islam, whose dietary laws fall under "halal," mandate that the animal be ritually slaughtered with specific prayers.

The practice salting of meat helps fight bacteria, but probably not more than other modern antimicrobial techniques, Regenstein said.

"We're talking about 4,000 years of salting having benefit, and the rest of the science, in a sense, has caught up in the last 10 years," he said.

If sodium is a concern because of high blood pressure, there are butcher shops that sell meat with different kinds of salt, or unsalted meat for broiling.

The Jewish custom of separating milk and meat -- not eating the two at the same meal and, for the most strict adherents, having separate plates and utensils for each -- does not appear to have dietary advantages or disadvantages, experts say.

In a practical sense, this tradition forces people to make their meals more diverse and plan them out more carefully, Regenstein said. Usually, people will not eat as much meat overall when they practice this kosher separation, he said.

Hold the ham, shellfish

Judaism and Islam share a restriction against eating pork. Some say this helps stave off trichinosis, a parasitic disease that humans can get from eating undercooked or raw pork, Regenstein said. However, there is some question about whether pigs in the Middle East would have had trichinosis ages ago when these traditions were developed, he said.

In addition, Jews traditionally do not eat shellfish, such as shrimp. Again, there is some association with certain diseases, as well as pollution, but it's not clear that this tradition leads to better health. Moreover, one of the staples of Jewish ritual meals such as Passover is gefilte fish, made from carp, which eats shrimp anyway, he said.

Attitudes to alcohol

The Muslim prohibition of alcohol is not necessarily good or bad, Gans said. There is some research to suggest that alcohol in moderation improves good cholesterol, but it is not definitive, she said. Red wine is associated with positive effects such as cancer prevention, but grape juice may offer the same benefits, Regenstein said. Moreover, avoiding alcohol also skirts the negative social implications associated with the substance.

In Judaism, however, wine is woven into ceremonies such as those for Passover and the Sabbath service. In fact, some synagogues give small portions of wine to children.

Vegetarianism

People who practice religions such as Buddhism are vegetarians to varying degrees, with some members electing to cut out dairy and eggs in addition to animals and fish. Some Hindus are also vegetarian, and generally consider cows to be sacred.

As long as vegetarians get an adequate supply of vitamins and protein, this can be a healthy lifestyle, Gans said. Some do need an extra boost iron or other nutrient, however, and should meet with a dietitian to figure out what's best for them individually, Gans said.

A matter of taste?

This is just a smattering of traditions practiced by various groups today, and subgroups of the religions mentioned here may have specific additional restrictions on certain animals.

In the end, many religious dietary practices do not have any more impact on healthy eating than other habits that arise from personal preference, Gans said. Some people avoid shellfish because they simply do not like the taste, and do not get a determinant or benefit as a result.

But, said Regenstein, kosher and halal are not fundamentally sets of health laws. Though he follows kosher rules himself, as a teenager in a Jewish community in Newark, New Jersey, he was suspicious of the common wisdom that the milk and meat separation was healthier "because you don't mix the bacteria."

"When I got more formally involved, it was actually sort of nice to realize that in fact these are not health laws. They are in the official category of 'God said, you do,' and I don't have to go back and try to chase this down."

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Friday, September 11, 2009

Trying to lose weight? Watch what you drink

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75 percent of U.S. adults are projected to be overweight or obese by 2015, according to researchers. Americans consume anywhere from 150 to 300 more calories than they did three decades ago and half of those calories come from liquid. A new study out of John Hopkins Bloomberg School of Public Health finds that reducing liquid calories, especially from sugar-sweetened drinks such as punches, fruit juices and sodas, helps people lose weight and keep it off.

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Questions and answers

Question: Why the emphasis on liquid calories?


Americans consume more liquid calories now than they ever have before. But unlike calories from solid food, it's much harder for people to track how many calories they consume from drinking. The human body's systems for regulating hunger and food intake are complex. But scientists do know that the lack of physiological and environmental cues associated with drinking, like not having to chew or prepare a drink like you prepare a meal, play a role. For these reasons, liquid calories don't keep a person full and they are not as satisfying as solid food. They are usually "empty calories" as well because they generally lack any nutritional value. Video Watch more on the dangers of sweetened drinks »

Question: Are healthy drinks like smoothies and teas a better option when trying to lose weight?

Not really. As one dietitian CNN spoke to phrased it, "A calorie is a calorie is a calorie, no matter where it comes from." Many of the "healthy" drinks on the market today are loaded with sugar and various sweeteners. Drinking a 16-ounce fruit smoothie may seem like a healthy choice but it could have almost 300 calories in it that you might not account for somewhere else in your diet. Teas, fruit juices, shakes and fortified waters are all great examples of seemingly healthy drinks that can be loaded with calories

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The 10 most important nutrition stories of the last two decades

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America's relationship to food and health has certainly changed in the 20 years since Cooking Light debuted. Some of those changes may seem discouraging: Rates of obesity and diabetes have risen, food-borne illnesses frequently make headlines, and more people eat meals -- often fast food -- away from home than ever before.

Studies suggest that fish, rich in omega-3 fatty acids, is good for your heart, brain, joints, and possibly your mood.

Studies suggest that fish, rich in omega-3 fatty acids, is good for your heart, brain, joints, and possibly your mood.

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Look more closely, though, and you'll see that the last two decades also have brought many innovations that make eating healthfully easier than ever. The 10 stories outlined here grabbed headlines for a reason. They document the tools available to help all of us make smarter food choices. And that implies hope for a more healthful future.

Building a new pyramid

When the U.S. Department of Agriculture decided to design an icon of good nutrition, it considered a variety of shapes and finally settled on the Food Guide Pyramid in 1992. This was a departure from the four food groups (grains, meats, dairy, and fruits and vegetables) that had guided the public's eating habits for nearly half a century.

By the time the USDA announced plans to revamp it in 2003, some 80 percent of Americans recognized the pyramid. In 2005, the USDA unveiled a renovated pyramid, shortly after publication of the 2005 Dietary Guidelines, on which it is based. Like the guidelines, the new pyramid advises Americans to eat more fruits and vegetables, consume three servings of low-fat dairy and three or more ounces of whole grains daily, and moderate intake of healthful fats, such as those found in olive oil, nuts, and avocados. CookingLight.com: Fluid-Rich Foods

A staircase reminds users to stay active. There's one more big change: The new food pyramid is Web-based, allowing users to tailor it to their individual needs based on age, sex, height, weight, and activity level at mypyramid.gov.

Nutrition facts come to light

Knowing the calorie content of your favorite packaged foods used to be a guessing game. That changed in 1994 when the Food and Drug Administration required products to carry nutrition facts labels that listed the amount of calories, calories from fat, total and saturated fat, protein, carbohydrates, fiber, sugar, cholesterol, sodium, vitamins A and C, calcium, and iron per serving.

Trans fat is the label's newest addition. Since the FDA began requiring food manufacturers to list this unhealthy fat in 2006, a number of products, from snack foods to margarine to frozen meals, have been reformulated to eliminate it. And many food companies have also begun to include additional information voluntarily, from potassium, a mineral key to blood pressure control, to heart-healthy fats, such as mono- and polyunsaturated.

Fifty-one percent of adults take advantage of the information nutrition labels provide, according to the Cooking Light 2007 Insight survey (up from 43 percent in our 2003 survey). Reading labels not only reflects an interest in healthier eating, but studies show those who read nutrition facts labels are more likely to eat less of foods high in saturated fat than those who don't. CookingLight.com: Fat: Fact or fable?


Fish tales

The American Heart Association and U.S. Dietary Guidelines advise eating seafood twice a week. Rich in omega-3 fatty acids, it's good for your heart, brain, joints, and possibly your mood, as a number of studies suggest.

But what about mercury and other contaminants found in seafood? In 2004, the FDA and the Environmental Protection Agency issued seafood advisories for children under 12, pregnant and nursing women, and women who might become pregnant, suggesting they avoid shark, swordfish, tilefish, and king mackerel. The warning filtered into the general public's consciousness, and almost a third of Americans incorrectly came to believe the advice applied to everyone and extended to all species of fish, according to a survey by the Center for Food, Nutrition, and Agricultural Policy. CookingLight.com: 9 nutrition essentials

Fortunately, the confusion has been cleared. Last year, the Institute of Medicine declared the health benefits of eating seafood outweigh its risks, even for pregnant and nursing women.

Fat is not a four-letter word

For many people, straightening out the facts about fat has been tough. Long demonized -- 20 years ago, many grocery shelves were packed with nonfat and low-fat products -- mono- and polyunsaturated fats are now embraced for their health benefits.

Research has shown that these fats help improve blood cholesterol levels, either by cutting levels of low-density lipoprotein, one of the most damaging forms of cholesterol, or by boosting levels of high density lipoprotein, a protective type of cholesterol. The 2005 Dietary Guidelines made fat's revised role official, advising that a healthy intake could range from 20 percent of daily calories up to as much as 35 percent.

Adding fat to your diet is still best tempered with caution. At nine calories per gram, it contains more than twice the number of calories in protein or carbohydrates. Some types of fat are still to be avoided -- advice that hasn't changed for the past 20 years and isn't likely to change in the future. The AHA, the National Heart Lung and Blood Institute, and the Dietary Guidelines all urge limiting both saturated and trans fats as a result of their roles in promoting heart disease.

Whole grains go mainstream

Most grocery stores now stock whole-grain pasta, bread, crackers, cereals, and other products that 20 years ago were found almost exclusively in health-food stores. Whole grains boost foods' nutritive value, as they contain complex carbohydrates and fiber, which don't raise blood sugar levels the way foods made with refined grains do.

Until 2006, there was no official government definition of whole grains, which made it difficult for consumers to know that cracked wheat, stone-ground wheat, ordinary wheat flour, multigrain, and many other seemingly whole-grain sounding products were not the real thing.

Now, spotting whole-grain products is easier, thanks to stamps issued by the Whole Grains Council, a nonprofit group developed in 2003 to help identify whole-grain foods. Since then, more than 1,000 products from nearly 100 companies have qualified to use the stamps.

Food for what ails you

Food provides nourishment, and it also can help prevent health problems.

In developed countries, high blood pressure is a common problem of aging. But in populations where sodium intake is low, high blood pressure is much less common with age. To see whether food could make a difference, the NHLBI launched the Dietary Approaches to Stop Hypertension Study in 1997. The results proved that just two weeks of eating a diet low in sodium, rich in fruits and vegetables, fiber, whole grains, and modest amounts of healthful fats can significantly lower blood pressure. A follow-up study published in 2001 showed that DASH could help lower blood pressure for everyone, even for those who did not yet have hypertension.

More recently, researchers at the University of Toronto reported that a group of foods, each known to lower blood cholesterol levels, can together cut it as much as some prescription medications. Dubbed the Portfolio Eating Plan, the regimen includes almonds, soy, fiber, and margarine fortified with plant stanols and sterols (found in products such as Take Control or Benecol). Since the FDA approved fortification with these cholesterol-lowering substances in 2000, a growing number of products include them, including orange juice and chocolates.

Drink to good health

In 1987, we drank water from faucets, fountains, and coolers. The coffee we sipped was often brewed at home or purchased for about 50 cents a cup. Now most of us drink water from bottles and don't blink at paying $3 or more for a cup of fancy flavored coffee. No wonder beverages have become a major source of calories, accounting for 20 percent of daily intake. CookingLight.com: Nutrients women need most

To help consumers recognize healthier choices, a team of University of North Carolina scientists developed a beverage guidance system in 2006. The leading drink choice to quench thirst is water, followed by such low-calorie choices as tea, milk (nonfat or skim), and diet drinks, then juices and sports drinks.

Alcohol has made intriguing health inroads in the past 20 years. Throughout the 1980s and 1990s, research repeatedly observed that people who consume alcohol in moderation-one drink daily for women, two for men-had lower rates of heart disease.

Variety is the spice of life

Repeated studies have found people who take large doses of single nutrients-vitamin E, beta-carotene, vitamin C-aren't any healthier than people who don't. In some cases, large doses may actually be harmful.

For example, Finnish researchers found in the mid 1990s that smokers actually increased their risk of lung cancer when they took beta-carotene supplements. In January, Australian researchers reported that vitamin E increased blood pressure and heart rate in diabetics. CookingLight.com: Fitness-friendly snacks

Research also suggests that relying on dietary supplements may not fully cover your nutritional bases. In 2006, a panel convened at the National Institutes of Health concluded there is not enough evidence to recommend for or against taking multivitamins.

Time and again, research points to eating a variety of foods for optimal health -- wonderful news for anyone who enjoys eating. Choose fruits and vegetables in all the colors of the rainbow. Reach for whole grains, beans, and a wide range of lean protein, from a little red meat to seafood. But most of all, take the time to cook -- and savor -- meals that you can share with family and friends.

Fresh, healthful food abounds

From 1994 to now, the number of farmers' markets has more than doubled, according to the USDA. The local and seasonal fruits and vegetables such markets sell are the cornerstones of healthful diets.

Additionally, the number of specialty groceries focused on healthier eating also has grown. From Whole Foods and Trader Joe's to Bloom, Central Market, Hannaford, Harris Teeter, and Wegman's, these stores sell more than just food. They offer cooking lessons, nutrition information, and a gathering-place, community center sensibility. CookingLight.com: Build a smarter salad

Many of these markets stake their reputation on selling organic food -- a category that didn't have an official definition until 2002, when the USDA developed guidelines governing the growth, production, and certification of organic foods. Since then, organic food sales have grown by roughly 20 percent each year. Today, certified organic food is so common that it's even sold in large chain groceries, such as Giant, Safeway, Costco, and Wal-Mart.

Although there's little proof that eating organic will make you healthier, it may make your conscience feel better, since evidence indicates organic products can be good for the environment.

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Thursday, September 10, 2009

Thinner is better to curb global warming, study says

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Here's yet another reason to stay in shape: Thinner people contribute less to global warming, according to a new study.

More than 1 billion adults worldwide are overweight, and about 300 million are obese.

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More than 1 billion adults worldwide are overweight, and about 300 million are obese.

Researchers at the London School of Hygiene and Tropical Medicine published a study showing that, because of food production and transportation factors, a population of heavier people contributes more harmful gases to the planet than a population of thin people.

Given that it takes more energy to move heavier people, transportation of heavier people requires more fuel, which creates more greenhouse gas emissions, the authors write.

"The main message is staying thin. It's good for you, and it's good for the planet," said Phil Edwards, senior lecturer at the London School of Hygiene and Tropical Medicine.

The study offers this novel approach to the global warming problem as U.S. lawmakers discuss the future of climate change legislation. This week, the the House Energy and Commerce Committee is scheduled to begin on a comprehensive energy and climate bill. On Friday, the Environmental Protection Agency announced that six greenhouse gases pose potential health hazards, an announcement that could prompt the regulation of the gases.

More than 1 billion adults worldwide are overweight, and about 300 million are obese, the study said. Generally, the body mass index, a measure of obesity, is increasing in most countries worldwide, from China to European countries to the United States.

BMI is going up because of the availability of food and motorized transportation, Edwards said. People are less active now than they were 30 years ago, and the prevalence of fast food has given people less healthy, more energy-dense options.

Using statistical models, the authors compared the distribution of BMI in the United Kingdom in the 1970s -- when 3.5 percent of the population was obese -- with a prediction for the country's BMI distribution in 2010, reflecting 40 percent obesity.

"In terms of environmental impact, the lean population has a much smaller carbon footprint," Edwards said.

The population with 40 percent obese people requires 19 percent more food energy for its total energy expenditure than the population with 3.5 percent obese people, the study showed.

This 19 percent increase in food consumption translates into an increase of 270 million metric tons of greenhouse gas emissions, the study said.

"The findings make sense and highlight an important global co-benefit of losing weight, along with the significant personal health benefits," said Patrick Kinney, associate professor at Columbia University's Mailman School of Public Health, who was not involved in the study.

In terms of obesity rate, the U.S. population is not far off from the overweight population model in this study. The country has 33.3 percent obese people, according to the Mayo Clinic.

The study suggests that governments have a responsibility to encourage people to be more physically active, Edwards said. Active transportation, such as cycling and walking, helps maintain a healthy weight but requires safe streets, he said.

"If the government wants to promote active transport, which would be good for the environment and for individual health, it needs to make the environment safe to do that," he said.

Although climate change has come into the forefront as a major world problem recently, this is not the first time scholars have thought about the connection between fossil fuel and body fat.

In 1978, a year the United States experienced an oil shock, a study in the American Journal of Public Health showed that if all overweight people in the country aged 18 to 79 reached their optimal weight, the resulting energy savings would equal 1.3 billion gallons of gasoline.

After the dieting period, about 750 million gallons of gasoline would be saved every year, said the authors, Bruce Hannon, professor at the University of Illinois, Urbana-Champaign, and Timothy Lohman, now professor emeritus at the University of Arizona.

Today, research has shown that the obesity epidemic costs the United States about $100 billion a year, said Dr. Martin Donohoe of Portland State University, who runs the Web site Public Health and Social Justice. In terms of energy expenditure, the average food product travels 1,500 miles to get to your table, he said.

Some measures to curb obesity include making healthier meals available in schools, putting nutritional information on food packages and menus, and banning trans fats, he said.

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'Miracle fruit' turns sour things sweet

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The "miracle fruit" makes acidic foods, such as lemons and grapefruits, sweet and candy-like.

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The small fruit has the color of a cranberry, the shape of an almond and tastes like a flavorless gummy.

The "miracle fruit" makes acidic foods, such as lemons and grapefruits, sweet and candy-like.

But after chewing the fruit and rubbing the pulp against the tongue, the berry, known by a promising name -- "miracle fruit" or Synsepalum dulcificum -- releases a sweetening potency that alters the taste buds.

For about 15 to 30 minutes, everything sour is sweet.

Lemons lose their zing and taste like candy. Oranges become sickeningly sweet. Hot sauce that usually burns the tongue tastes like honey barbecue sauce that scorches as it trickles down the throat.

Through word of mouth, these miracle fruits have inspired "taste tripping" parties, where foodies and curious eaters pay $10 to $35 to try the berries, which are native to West Africa.

About five months ago, a Miami, Florida, hospital began studying whether the fruit's sweetening effects can restore the appetite of cancer patients whose chemotherapy treatments have left them with dulled taste buds.

"What happens in patients is the food tastes so metallic and bland, it becomes repulsive," said Dr. Mike Cusnir, a lead researcher on the project and oncologist at Mount Sinai Medical Center. "Most of the patients undergoing chemotherapy have weight loss. Then they cut further into their diet and then this furthers the weight loss. It causes malnutrition, decreased function of the body and electrolyte imbalance."

One of Cusnir's patients, Don Blechman, told him about the fruit after discovering it while he and his wife volunteered at a tropical fruit garden in Coral Gables, Florida.

"We didn't need it, but we thought it's wonderful and told a lot of people," said his wife, Terry Blechman. "If you can't eat because everything tastes bitter, and one berry gives you back your taste for a meal, what is it worth? It's worth everything."

Cusnir filed for an investigational new drug application, which is required by the U.S. Food and Drug Administration to use an unapproved product in a new patient population. His study seeks 40 cancer patients.

"The majority have given good feedback that it did improve taste," Cusnir said. "A few patients felt there wasn't much change. The feedback is mixed as it usually is in any situation. It's been encouraging, but we haven't analyzed the data so far."

If the results show promise of helping cancer patients to maintain a healthy body weight and appetite, there will be bigger studies, Cusnir said. The process is expected to take several years.
"If this doesn't work, we move on and spend resources on something else instead," he said.

It's not only cancer patients and foodies turning to the miracle fruit. Carmen Duporte, a Fort Lauderdale,Florida, resident, integrated the miracle fruit into her routine drinks of aloe vera juice. Duporte drinks the juice to cleanse her digestive system, but hates its thick and long-lasting taste.

"It's really bitter," she said. "If I don't take [the miracle fruit], I'd be having that taste for a long time. When I drink it with the fruit, there's no taste in my mouth."

Duporte told her friends about the berries, because "it's such a friendly fruit." Through word of mouth, the miracle fruit has picked up buzz.

"This new resurgence of interest is fascinating," said Linda Bartoshuk, a professor at the University of Florida's Center for Smell and Taste. "It popped on the scene and people are having fun with it. It motivated us to go back and do research."

Bartoshuk seeks to better understand how the berry works. In the 1970s, she studied the fruit while working for the U.S. Navy and Army labs.

The miracle fruit contains a natural protein, called miraculin, which has sugar molecules that bind to the tongue, she said. When acid enters the mouth, the sugar molecules press into the sweet receptors.

Some of her colleagues are looking into how the berries could help people with diabetes and obesity, because they sweeten the taste of food. Unlike sugar, the miracle fruit has very few calories and unlike artificial sweeteners, the berries are natural.

Bartoshuk said she hasn't seen any reports of dangers from eating the berries, but warned against premature health benefit claims.

"Everyone's immediate response is it's an artificial sweetener, it'll help you lose weight," she said. "But the bad side is artificial sweeteners don't help you lose weight. Any real claims for health benefits are going to have to be supported by good research."

After the FDA in 1974 declared that miraculin was a food additive, the miracle fruit grew in obscurity in South Florida and remained a local treat.

Individual farmers, like Curtis Mozie, a retired post office employee, raised the berries and began shipping them to customers who found him on the Internet.

"I felt like everyone else needs to be aware of this fruit," said Mozie of Fort Lauderdale. "Why was it kept hush-hush? I wanted people to enjoy the fruit and enjoy the experience and any edible item that doesn't taste good with the help of the miracle fruit."

Curiosity about the fruit began to circulate among exotic fruit seekers. After a few media reports, other small farms cropped up and companies started selling the miracle fruit and tablets.

"No offense meant to people who want to pay money to eat miracle fruit and weird things. We used to do that every Friday," said Richard Campbell, who oversees the tropical fruits at the Fairchild Tropical Fruit Garden. "We grew up with miracle fruit. People came over, ate miracle fruit and sat around eating limes. I feel stupid I didn't think of charging anyone."

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Fewer calories equals a longer life -- At least in monkeys

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Cutting daily calorie intake by 30 percent may put the brakes on the aging process, have beneficial effects on the brain, and result in a longer life span, according to a new 20-year study of monkeys published in the journal Science.

Calorie restriction needs to be done carefully in order not to turn into malnutrition, say experts.

Calorie restriction needs to be done carefully in order not to turn into malnutrition, say experts.

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The study confirms in primates what's long been known in other species, including mice, worms, and flies. And it's no surprise to the humans who have taken the animal research to heart and adopted calorie restriction as a means to a (hopefully) longer and healthier life.

Brian M. Delaney has been eating 20 percent fewer calories than most people of his size and stature since 1992. "The new study confirms everything we have seen," says Delaney, coauthor of "The Longevity Diet" and president of the nonprofit Calorie Restriction Society, which had 2,000 members in 2007 and thousands more on mailing lists. "It also adds some new information on brain volume changes."

In the study of 76 adult rhesus monkeys (a species that shares many similarities with humans), only 13 percent of the calorie-restricted animals died during the 20-year period, compared with 37 percent of monkeys allowed to eat their usual diet. (The study began with 30 monkeys; an additional 46 were added in 1994.) Health.com: I survived the Master Cleanse -- Then gained all the weight back

At the start of the study, the researchers analyzed how much the monkeys were eating and then cut the calories by 10 percent each month for three months in the calorie-restricted group. The other monkeys were allowed to eat as much as they wanted.

The calorie-restricted monkeys preserved volume in areas of their brain that have been linked to motor control, memory, and problem-solving.


The new study shows the effects of calorie restriction in primates that are closely related to humans," says lead researcher Ricki Colman, Ph.D., an associate scientist at the Wisconsin National Primate Research Center, in Madison. "Monkeys in the calorie-restricted group are more likely to live healthier, longer." The oldest monkey in the study is now 29. This species has an average lifespan of 27 when in captivity.

"We don't know about ultimate longevity yet, but the monkeys in the calorie-restricted group are unencumbered by age-related diseases and brain atrophy, which is linked to cognitive ability," says Colman. Health.com: I had a heart attack at 43

Monkeys in both groups consumed very healthful diets. "We are studying calorie restriction, not malnutrition," stresses Colman, who does not follow this type of diet herself. The study diet included 15 percent protein and 10 percent fat and was enriched with vitamins.

As an advocate of calorie-restricted diets, Delaney says he isn't starving, despite his low-calorie lifestyle.

He eats a hearty breakfast including a large bowl of low-fat granola and fruit, soy milk, nonfat yogurt, and a cup of coffee. Delaney admits his 900-or-so-calorie breakfast is more than most people consume in the morning, but he then skips lunch, works an eight- or nine-hour day, and eats a high-fiber, vegetarian dinner, keeping his total intake under 2,000 calories a day. (An average adult male consumes 2,618 calories a day, according to statistics from the Centers for Disease Control and Prevention.)

As a result, Delaney may live a longer and healthier life than his peers who consume more calories. Studies in mice, worms, and flies have shown that this type of diet -- which is not a form of malnutrition or an exercise in self-starvation -- results in longer lives and a lower risk of some cancers, heart disease, and other illnesses associated with aging. Health.com: Why belly fat is bad for your lungs, and why exercise is good

Exactly how a calorie-restricted diet helps stave off age-related diseases and extend lifespan is unknown, but controlling calories can help people lose weight or maintain a healthy weight. Obesity is a major risk factor for many diseases. Eating healthy, nutrient-dense foods can also produce important physiologic changes in the body, which may lower disease risk.

However, not everyone agrees that such severe calorie restriction is a good idea. Keri Gans, R.D., a nutritionist in private practice in New York City and a spokesperson for the American Dietetic Association, has some concerns about both the short- and long-term effects of calorie restriction.

"If you go too far, it can lead to a lot of problems such as dizziness and fatigue in the short term," she says. "In the long term, there can be nutritional deficiencies, decreases in bone mineral density that can lead to osteoporosis, and menstrual irregularities that can lead to infertility.

"Once you start to restrict calories, there is no guarantee of adequate nutrition unless you are following a plan monitored by a registered dietitian," she says. "The less calories you consume, the harder it may be to ensure that your diet includes foods that provide proper nutrition." Health.com: 5 secrets to get-slim success

Even though Delaney is a believer, he agrees that calorie restriction is not for everyone. "If you are pregnant or really old, it is not clear that you can get much benefit, and it may be risky," he says.

He is also quick to point out that a calorie-restricted diet for humans means different things to different people.

"It isn't any one number; it's a principle," he says. "Cutting daily calories by 5 percent is a mild version of calorie restriction, and according to research in lab animals and some in humans, you will get some of the benefits," he says. Others may restrict calories by 20 percent, he says. Health.com: 8 tips for controlling portion sizes

"There really isn't any magic number," Delaney says. His advice? Forget about total calories, measure what you are eating, and go to your doctor to check your fasting glucose, cholesterol, and blood pressure. "Reduce your calories by a little bit for a few months, then go back to the doctor and see if your numbers have improved," he suggests.

If your numbers have improved, it may mean you are aging at a reduced rate, he says. High cholesterol, blood pressure, and diabetes are all linked to heart disease and premature death.

Malena Perdomo, R.D., an American Dietetic Association spokesperson and a clinical outpatient dietitian at Kaiser Permanente Colorado, in Denver, says the new study is interesting. "We have seen similar results in mice and we know that by controlling body weight, we have better health outcomes," she says.

Controlling portion sizes and reducing calories is the key to weight loss, but restricting calories should be done carefully, she advises. "The first step is to get rid of high fat, high sugar foods in the diet, and then we move on to the quality of diet and make sure there are adequate fruits, vegetables, whole grains, lean protein, and low-fat dairy in the diet."

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Wednesday, September 9, 2009

How to Stretch Your Food Budget

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While your food budget may have tightened , you need not sacrifice taste and freshness to save a few dollars. Aim for the best value in terms of quality, freshness, and good nutrition to feed your family healthful foods. We'll show you how.

Serve one or two vegetarian meals a week to cut costs, or use a small amount of meat to add flavor to a dish.


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Serve one or two vegetarian meals a week to cut costs, or use a small amount of meat to add flavor to a dish.

Eat more meatless meals.

Meat accounts for the most expense at grocery store visits, so make one or two vegetarian dinners a week to cut costs. Dishes based on pantry staples such as rice, whole grains, beans, and legumes are protein-rich, filling, and inexpensive; add seasonal produce for crunch, freshness, and color. A bonus: Research shows eating more plant-based foods may lower your risk for heart disease, diabetes, and some cancers. MyRecipes.com: Wheat berry salad with goat cheese

Make a meal plan.

This strategy may be the most challenging to consistently employ but can make the biggest dent in your budget. Sit down once a week and plan all the meals for that week, and then shop only for the items you need to prepare those meals. Allow for leftovers in your meal plan, and be realistic about how many nights you might eat out or be too busy to cook. Not only does this strategy cut down on the amount of food you buy at the grocery store, but it also decreases the amount of food you waste. Learn more about menu planning with Cooking Light's guide. MyRecipes: Grilled spice-rubbed whole chicken

Do it yourself.

For maximum savings, skip convenience products, as you pay a premium for the work that's done for you. For just a few extra minutes, you can save by chopping your own produce, for example. On the weekends when you have extra time, or some nights after putting the kids to bed, do a little work that puts you ahead for the next day, like making a pizza dough that sits in the fridge overnight. MyRecipes.com: Grilled pepper, onion, and sausage calzones

Learn to stretch meat, poultry, and fish.

Instead of making protein the center of the plate, use it sparingly for flavor and texture -- almost as if it's a condiment. Extend beef by tossing a conservative amount in a vegetable-rich stir-fry, for example, or combine a small quantity of shrimp with pasta. Pizzas, calzones, pasta bakes, and casseroles are easy dishes that use this strategy to great effect. Health.com: 10 easy ways to eat natural

Eat in season.

Out-of-season produce is costly and lacks flavor. Skip it; instead choose fruits and vegetables that are in season. When produce is at its peak, there's an abundance of it -- and you can find it for a bargain. In the summer, enjoy tomatoes, cucumbers, fresh herbs, bell peppers, and more. During fall and winter, look to winter squashes; dark, leafy greens; citrus; and sweet potatoes. And in spring, try berries, asparagus, artichokes, and fresh peas.

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