Conventional logic in nutrition has held that when it comes to weight loss, all calories are the same, whether they come from proteins, fats or carbohydrates. But a new study from the Harvard School of Public Health found that dieters on a low-carb diet who consumed more calories than dieters on a low-fat diet still lost more weight. Critics of the study say the dieters need to be studied over the next year to see if they keep the weight off before rewriting the rules on calories.

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