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With some diets, your body is forced to break down muscle to use for energy. The lower your muscle mass, the slower your metabolism. With less muscle and a slower metabolism, it then becomes a lot easier to put body fat back on after coming off the diet.The participation of fat and of carbohydrate in the energy expenditure during light exercise (300 kpm/min) on the bicycle ergometer was studied in 6 healthy men 19 to 24 years of age, living for periods of about 70 days under strictly controlled metabolic ward conditions while consuming the following diets: (1) 3,000 Cal., 73 gm of protein, 107 gm of fat, 463 gm of carbohydrate (basal diet); (2) 3,000 Cal., 33 gm of protein, 114 gm of fat, 462 gm of carbohydrate; (3) 3,500 Cal., 89 gm of protein, 231 gm of fat, 247 gm of carbohydrate; and (4) 1,600 Cal., 67 gm of protein, 65 gm of fat, 175 gm of carbohydrate. In connection with the metabolic measurements, 24-hour urine samples were collected for nitrogen and creatinine determinations. The basal metabolic rate was determined 14 to 15 hours postprandial using the Noyons BMR apparatus, which was also used for the analysis of expired air collected between 20 and 30 minutes of work at 300 kpm. In separate experiments, metabolic measurements were made during work, two hours following ingestion of 100 gm of glucose.