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Not all calories equal, study of three diets suggests
27/06/2012 2:59:00 PM
CTVNews.ca Staff
If you want to lose weight, the classic advice has always been Burn more calories than you take in. But a new study suggests it might depend on what kind of calorie you burn.
A new study suggests we burn certain kinds of calories more efficiently while on certain diets, making weight loss easier.
The study, published in the Journal of American Medical Association, found that dieters were better able to maintain weight loss while on a low-glycemic index or low-carbohydrate diets compared to those on a low-fat diet.
In fact, the low-GI diets showed itself to be the best of the bunch, in part because it was easier to stick to and didn't seem to lead to the kind of stress and inflammation seen in low-carb diets.
A low-GI diet includes foods we digest slowly, such as large-flake oatmeal and rye bread, and discourages high- GI foods such as instant oatmeal and white bread.
The study was led by Dr. David Ludwig, director of the New Balance Foundation Obesity Prevention Center at Boston Children's Hospital. Ludwig and colleague Cara B. Ebbeling tested the three kinds of diets on a small group of 21 overweight and obese young adults.
All the participants were asked to lose 10 to 15 per cent of their body weight. Then, to see if they could maintain the weight loss, they were broken into three groups:
Each participant tried each diet for four weeks.
The researchers found that the volunteers burned an average of 350 more calories a day when they ate a low-carbohydrate diet, compared to when they ate a low-fat diet.
"The results of our study challenge the notion that a calorie is a calorie from a metabolic perspective," the researchers write.
They also burned 150 more calories more a day on the low-glycemic index diet compared with the low-fat diet.
Those on the low-carbohydrate diet saw their levels of a key stress hormone called cortisol rise, a change that can lead to insulin resistance and cardiovascular disease. The low-carbohydrate diet also raised C-reactive protein levels, which can increase the risk of cardiovascular disease.
The authors suggests a low-glycemic diet might be best because low GI carbohydrates digest slowly, helping to keep blood sugar and hormones stable after the meal.
Ebbeling says low-GI diets might be easier to stick to on a day-to-day basis, compared to low-carb and low-fat diets, which many people find limiting," she said.
"Unlike low-fat and very- low carbohydrate diets, a low-glycemic-index diet doesn't eliminate entire classes of food, likely making it easier to follow and more sustainable, she said in a statement.
http://news.sympatico.ctv.ca/home/not_all_calories_equal_study_of_three_diets_suggests/bd399e70
Yet another study just released. My underline, what stress and inflammation are they discribing?
27/06/2012 2:59:00 PM
CTVNews.ca Staff
If you want to lose weight, the classic advice has always been Burn more calories than you take in. But a new study suggests it might depend on what kind of calorie you burn.
A new study suggests we burn certain kinds of calories more efficiently while on certain diets, making weight loss easier.
The study, published in the Journal of American Medical Association, found that dieters were better able to maintain weight loss while on a low-glycemic index or low-carbohydrate diets compared to those on a low-fat diet.
In fact, the low-GI diets showed itself to be the best of the bunch, in part because it was easier to stick to and didn't seem to lead to the kind of stress and inflammation seen in low-carb diets.
A low-GI diet includes foods we digest slowly, such as large-flake oatmeal and rye bread, and discourages high- GI foods such as instant oatmeal and white bread.
The study was led by Dr. David Ludwig, director of the New Balance Foundation Obesity Prevention Center at Boston Children's Hospital. Ludwig and colleague Cara B. Ebbeling tested the three kinds of diets on a small group of 21 overweight and obese young adults.
All the participants were asked to lose 10 to 15 per cent of their body weight. Then, to see if they could maintain the weight loss, they were broken into three groups:
Each participant tried each diet for four weeks.
The researchers found that the volunteers burned an average of 350 more calories a day when they ate a low-carbohydrate diet, compared to when they ate a low-fat diet.
"The results of our study challenge the notion that a calorie is a calorie from a metabolic perspective," the researchers write.
They also burned 150 more calories more a day on the low-glycemic index diet compared with the low-fat diet.
Those on the low-carbohydrate diet saw their levels of a key stress hormone called cortisol rise, a change that can lead to insulin resistance and cardiovascular disease. The low-carbohydrate diet also raised C-reactive protein levels, which can increase the risk of cardiovascular disease.
The authors suggests a low-glycemic diet might be best because low GI carbohydrates digest slowly, helping to keep blood sugar and hormones stable after the meal.
Ebbeling says low-GI diets might be easier to stick to on a day-to-day basis, compared to low-carb and low-fat diets, which many people find limiting," she said.
"Unlike low-fat and very- low carbohydrate diets, a low-glycemic-index diet doesn't eliminate entire classes of food, likely making it easier to follow and more sustainable, she said in a statement.
http://news.sympatico.ctv.ca/home/not_all_calories_equal_study_of_three_diets_suggests/bd399e70
Yet another study just released. My underline, what stress and inflammation are they discribing?
