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American Journal of Clinical Nutrition, Vol 34, 357-361, Copyright © 1981 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Fecal characteristics in healthy young adults consuming defined liquid diets or a free-choice diet

CL Kien, A Cordano, DA Cook and VR Young

Fat and nitrogen absorption and fecal characteristics were studied in 10 healthy, young adults who ingested a free-choice diet for 12 days and then isocaloric amounts of one of two nutritionally complete liquid defined formula diets during a succeeding 12-day period. Apparent fat absorption was 98 to 99% of intake with both defined formula diets and 95% of intake on the free-choice diet. Nitrogen digestibility was determined during the liquid diet period, and averaged 95 to 98% of intake. There were no statistically significant differences between the liquid diets and the free-choice diets with respect to fecal wet or dry weight, transit time, or stool frequency. Individual stool weights averaged 83 to 96 g on the free-choice or liquid formula diets and were comparable to other values reported in the literature. These results support the theory that a critical volume of feces must accumulate in the colon before defecation occurs, regardless of diet composition.


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V. A Mustad, S. S Jonnalagadda, S. A Smutko, C. L Pelkman, B. J Rolls, S. R Behr, T. A Pearson, and P. M Kris-Etherton
Comparative lipid and lipoprotein responses to solid-food diets and defined liquid-formula diets
Am. J. Clinical Nutrition, November 1, 1999; 70(5): 839 - 846.
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Copyright © 1981 by The American Society for Nutrition