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SECOND INTERNATIONAL SYMPOSIUM
ON THE ROLE OF SOY
IN PREVENTING AND TREATING CHRONIC DISEASESeptember 15-18, 1996
Brussells, Belgium
POSTER ABSTRACTSWhole - Body Protein Turnover In Humans Fed A Soy Protein-Rich Vegetable DietN.Gausseres, I. Catala, S. Mahe, F. Bornet, B. Guy- Grand And D. Tome
Unité INRA Nutr. Hum et Physiol. Intest, INA-PG, 16 rue Claude Bernard, 75005 Paris, France, Uniteé INRA Ecol. Et Physiol. Du Système Dig., 78350 Jouy en Josas, France, Eridania Béghin-Say, Vilvoorde R&D Center, Havenstraat 84, B-1800 Vilvoorde, Belgium, Service de Médecine interne, Hôpital de l'Hotel Dieu, 75001 Paris, France.
Introduction: The ability of different protein sources to maintain an appropriate level of protein turnover is of interest for the evaluation of their nutritional quality, i.e. to meet human protein requirement. Low content of some essential amino acid is often suspected to limit the nutritive value of plant foods. The objective of the present study was to measure the whole-body protein turnover in young men fed a soy protein rich diet in comparison with a control western animal protein-rich diet.
Methods:Twelve free-living subjects were divided into two groups of 6 subjects who were given for 2 weeks either a 85% vegetable protein diet (diet A) or a control animal protein-rich diet (diet B). Whole-body protein turnover was measured at the end of the 2 weeks controlled diet period by the 15N - glycine test performed in the fed state according to Fern et al (1981).
Results and discussing:During the 9-h of the test, ammonia excretions was significantly higher in the group receiving the diet B than in the group receiving the diet A (P<0.05) whereas no significant difference was observed for both total nitrogen and urea nitrogen excretion. Both the protein synthesis and the protein breakdown were similar in subjects fed either diet A or diet B. The net protein deposition measured in the fed state was simular with both diets (0.07 g prot/kg/h). In conclusion, young adults fed for two weeks a soya-bean protein - rich vegetable diet have a satisfactory level of protein turnover suggesting that properly procesed soya-bean protein are fully capable of meeting the long term adult essential amino requirements.
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