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American Journal of Clinical Nutrition, Vol 56, 630-635, Copyright © 1992 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Body composition, energy utilization, and nitrogen metabolism with a 4.25-MJ/d low-energy diet supplemented with pyruvate

RT Stanko, DL Tietze and JE Arch
Clinical Nutrition Unit, Montefiore University Hospital, Pittsburgh, PA 15213.

We measured body composition, energy deficit, and nitrogen metabolism in 14 obese women housed in a metabolic ward, who consumed a 4.25-MJ/d liquid diet (68% carbohydrate, 22% protein) for 21 d with or without pyruvate (PY; n = 7) partially, isoenergetically substituted for glucose (placebo; n = 7). Body composition and leucine oxidation and turnover were determined before and after weight loss. Energy deficit was calculated from resting metabolic rates. Subjects fed pyruvate showed a greater weight loss (PY = 5.9 +/- 0.7 kg, placebo = 4.3 +/- 0.3 kg, P less than 0.05), fat loss (PY = 4.0 +/- 0.5 kg, placebo = 2.7 +/- 0.2 kg, P less than 0.05), kg wt loss/4.25-MJ deficit (PY = 0.22 +/- 0.01 kg, placebo = 0.17 +/- 0.01 kg, P less than 0.05, and kg fat loss/4.25-MJ deficit (PY = 0.15 +/- 0.01 kg, placebo = 0.11 +/- 0.01 kg, P less than 0.05). Nitrogen balance (urine and stool) and leucine oxidation and turnover were similar in both groups. We conclude that the dietary modification whereby the three-carbon compound pyruvate is isoenergetically substituted for the six-carbon compound glucose in a 4.25-MJ/d, low-energy diet will increase fat and weight loss.


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