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Deliberate overfeeding in women and men: energy cost and composition of the weight gain*

  • Gilbert B. Forbes (a1), Marilyn R. Brown (a2), Stephen L. Welle (a3) and Barbara A. Lipinski (a4)
Abstract

1. Thirteen adult females and two males were overfed a total of 79–159 MJ (1900–38 000 kcal) during a 3-week period at the Clinical Research Center, Rochester. The average energy cost of the weight gain was 28 kJ (6.7 kcal)/g, and about half the gain consisted of lean body mass (LBM) as estimated by 40Kcounting.

2. A survey of the literature disclosed twenty-eight normal males and five females who had been overfed a total of 104–362 MJ (2500–87000 kcal) under controlled conditions: twenty-five of these had assays of body composition, and three had complete nitrogen balances.

3. When these values were combined with those from our subjects (total forty-eight), there was a significant correlation between weight gain and total excess energy consumed (r 0.77, P < 0.01) and between LBM gain and excess energy (r 0.49, P < 0.01). Based on means the energy cost was 33.7 kJ (8.05 kcal)/g gain and 43.6% of the gain was LBM; from regression analysis these values were 33.7 kJ (8.05 kcal)/g gain and 38.4% of gain as LBM.

4. Individual variations in the response could not be explained on the basis of sex, initial body-weight or fat content, duration of overfeeding, type of food eaten, amount of daily food consumption or, in a subset of subjects, on smoking behaviour.

5. The average energy cost of the weight gain was close to the theoretical value of 33.8 kJ (8.08 kcal)/g derived from the composition of the tissue gained.

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References
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British Journal of Nutrition
  • ISSN: 0007-1145
  • EISSN: 1475-2662
  • URL: /core/journals/british-journal-of-nutrition
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