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Evaluation Of Protein In Foods Xii. Effects Of Calorie Restriction

Narayan Rao, M. and Morrison, A. B. (1966) Evaluation Of Protein In Foods Xii. Effects Of Calorie Restriction. Canadian Journal of Chemistry, 44. pp. 1365-1375.

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Abstract

The effects of calorie restrictior~ on net protein utilization (N.P.U.) were studied with proteins of different nutritional value. When protein intake remained constant, reduction in the intake from 32 to 16 kcal per day resulted in a rapid decline in N.P.U. values. Increases in body weight were directly proportional to calorie intake per %g0J3 body weight. Even under conditions of marked caloric restriction, only 70-75y0 of the ingested protein was used for energy purposes, the rest evidently being used in essential anabolic activities. Studies on carcass co~npositicrn showed that animals on restricted calorie intakes tried to adapt through shifts in metabolism, arid utilized fat in preference to protein for caloric requirements. KN-4 metabolism in liver and muscle was influenced by energy and rotein intakes. i d e n the percentage of calories from protein remained constant, K.P.U. values were not markedly altered until the calorie intake reached the maintenance energy requirement sf 150 kcal per kg0.73 body weight. Below this point, N.P.U. values dropped sharply, the rate of decrease being greater for proteins of higher nutritive value. Differences in the nutritive value of proteins, as shown by their ability to satisfy protein requiremetats in protein-depleted rats, still existed even at restricted intakes of calories.

Item Type: Article
Uncontrolled Keywords: calories protein utilization nutritive value proteins
Subjects: 600 Technology > 08 Food technology > 16 Nutritive value > 03 Proteins
Divisions: Dept. of Biochemistry
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 24 Feb 2010 07:12
Last Modified: 28 Dec 2016 08:30
URI: http://ir.cftri.com/id/eprint/9311

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