The average gain in fat mass was 5.4 kg or about 210 MJ (52,220 kcal), whereas the gain in fat-free mass was 2.7 kg or approximately 11.5 MJ (2754 kcal). On average, about 121 MJ (29,000 kcal) did not appear as weight gain when constants were used to convert tissue gains into energy equivalents,17 and presumably this energy was dissipated in some way. One third of the weight gained by the group as a whole was in the form of fat-free mass, a proportion comparable with that reported previously.4 , 9 The man who gained the most weight (13.3 kg) had no evidence of energy dissipation by any mechanism, whereas in the man who gained the least weight (4.3 kg) only about 40 percent of the extra calories were deposited as body tissues. The men who gained more fat than lean tissue tended to gain more weight and to gain more fat in the truncal—abdominal area.
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