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American Journal of Clinical Nutrition, Vol 30, 1135-1146, Copyright © 1977 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Effects of acute caloric restriction on cholesterol metabolism in man

BJ Kudchodkar, HS Sodhi, DT Mason and NO Borhani

The effects of acute caloric restriction on cholesterol balance and kinetics of plasma cholesterol specific activity were investigated in five hyperlipemic subjects with varying degrees of obesity. Caloric restriction decreased plasma triglycerides by 41 +/- 12%, plasma cholesterol by 11 +/- 9%, and the ratio of esterified to free cholesterol by 12 +/- 7+. Immediately on institution of caloric restriction there appeared to be an influx of tissue cholesterol into plasma and a reduction in endogenous synthesis of cholesterol. The cholesterol balance decreased from 1,469 +/- 441 to 1,212 +/- 349 mg/day and the rate of decay of plasma cholesterol specific activity decreased 62 +/- 3%. The effect of caloric restriction on hepatic synthesis of bile acids was also very prompt. The total fecal bile acids were reduced immediately by 36 +/- 7%. Because the effect on fecal excretion of deoxycholic acid was greater than that on fecal lithocholic acid, it was suggested that hepatic synthesis of cholic acid was reduced more than the synthesis of chenodeoxycholic acid. Caloric restriction did not cause any change in the percentage of absorption of dietary cholesterol (40 +/- 2% versus 42 +/- 3%). These observations are in accord with our model relating cholesterol metabolism with the metabolism of plasma lipoproteins in man.


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