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Am J Physiol Endocrinol Metab 238: E235-E244, 1980;
0193-1849/80 $5.00
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AJP - Endocrinology and Metabolism, Vol 238, Issue 3 235-E244, Copyright © 1980 by American Physiological Society

ARTICLES

Influence of low-energy diets on whole-body protein turnover in obese subjects

P. J. Garlick, G. A. Clugston and J. C. Waterlow

Rates of whole-body protein synthesis and breakdown in obese subjects have been measured by three methods: constant intravenous infusion of [1-14C]leucine, repeated oral doses of [15N]glycine, and a single oral dose of [15N]glycine. The three techniques gave similar rates of synthesis and breakdown when the subjects received a normal diet containing 8.0 MJ and 70 g protein. After 3 wk on a low-energy diet (2.1 MJ), repeat measurements were made. When the low-energy diet contained protein (50 g), rates of protein synthesis and breakdown were little different from those with the normal diet. When the low-energy diet contained no protein, there was a 40% fall in whole-body protein synthesis and a smaller fall in breakdown. Excretion of 3-methylhistidine in the urine did not change with either low-energy diet. We conclude that the decrease in dietary energy from 8.0 to 2.1 MJ did not influence protein turnover, but that dietary protein was necessary if rates of whole-body protein synthesis and breakdown were to be maintained.


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