Many popular diets emphasize either carbohydrate, protein or fat as the best way to lose weight. However, there have been few studies lasting more than a year that evaluate the effect on weight loss of diets with different compositions of those nutrients.


In a randomized clinical trial led by researchers at the Harvard School of Public Health (HSPH) and Pennington Biomedical Research Center of the Louisiana State University System, a comparison of overweight participants assigned to four different diets over a two-year period showed that reducing calories achieved weight loss regardless of which of the three nutrients was emphasized. The study, which was funded by the National Heart, Lung, and Blood Institute (NHLBI) of the National Institutes of Health, appears in the February 26, 2009 issue of The New England Journal of Medicine.


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