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Journal of Gerontology 1988 43(1):B5-B12; doi:10.1093/geronj/43.1.B5
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© 1988 The Gerontological Society of America

The Influence of Dietary Protein Source on Longevity and Age-Related Disease Processes of Fischer Rats

Keisuke Iwasaki1, Chester A. Gleiser2, Edward J. Masoro1, C. Alex McMahan2, Eun-Joo Seo1 and Byung Pal Yu1

1 Department of Physiology the University of Texas Health Science Center At San Antonio
2 Department of Pathology the University of Texas Health Science Center At San Antonio


   Abstract

The influence of replacing dietary casein with soy protein on longevity and age-related pathologic lesions of male Fischer 344 rats was investigated. Caloric intake and body weights were similar for rats on the two diets. Rats on the soy protein-containing diet had a median length of life of 844 days compared to 730 days for those on the caseincontaining diet (p < .002), and the ages of the 10th percentile survivors were 937 and 857 days, respectively (p > .02). The progression of chronic nephropathy was markedly retarded by replacing casein with soy protein. Only 7% of the rats dying spontaneously on the soy protein-containing diet exhibited end-stage chronic nephropathy compared to 41 % of the rats on the casein-containing diet. Clearly, the soy protein-containing diet enables ad libitum fed male Fischer 344 rats to be used as a model for aging research without the occurrence of renal failure as a major confounding problem

Received for publication December 12, 1986. Accepted for publication July 7, 1987.


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