Calories do count

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      Abstract

      There have been statements in the medical and the lay literature to the effect that weight loss occurs more rapidly with diets high in fat and protein asc compared to equi-caloric diets containing large amounts of carbohydrate. In the present study, subjects have been maintained for many weeks on constant calorie intake. At intervals, the composition of the diet has been changed, the fat intake varying from 12 to 83 per cent, protein from 14 to 36 per cent, and carbohydrate from 3 to 64 per cent of total calories. In any given subject, the rate of weight loss was essentially constant throughout the entire study. It is therefore obvious that the significant factor responsible for weight loss is reduction of calories, irrespective of the composition of the diet.
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