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American Journal of Clinical Nutrition, Vol 50, 93-99, Copyright © 1989 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

High-fiber diets: influence on characteristics of cecal digesta including short-chain fatty acid concentrations and pH

SE Fleming, MD Fitch and MW Chansler
Department of Nutritional Sciences, University of California, Berkeley 94720.

The effects of two sources of dietary fiber on the characteristics of cecal contents were assessed directly with miniature swine cannulated to facilitate frequent collections of cecal digesta. The short-chain fatty acid (SCFA) concentrations increased and the pH decreased at the same time that meal constituents entered the cecum; PEG was used as a dietary marker. The bean diet resulted in higher concentrations of acetate and total SCFA in cecal digesta, lower concentrations of butyrate, a larger SCFA pool size, and a more acidic pH than did the bran diet. Thus, we conclude that SCFA concentrations and acidity of the digesta are directly related and that dietary fibers can affect simultaneously several variables that are implicated as factors influencing colonic health.


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