The effect of meat protein and dietary fiber on colonic function and metabolism; I. Changes in bowel habit, bile acid excretion, and calcium absorption
1979
Cummings, J.H. | Hill, M.J. | Jivraj, T. | Houston, Helen | Branch, W.J. | Jenkins, D.J.A.
Dietary factors associated with large bowel cancer include fat and meat protein with an adverse effect and dietary fiber with a protective effect, and among high-incidence populations fecal bile acid levels are high. Low-protein, high meat protein, and high meat protein plus wheat fiber diets were eaten by 4 healthy subjects in 3 successive 3-week periods. Bowel habit, mean transit time, and fecal bile acid excretion were not significantly affected by change in protein intake. However, the diet with 31 g wheat fiber increased fecal weight significantly, shortened mean transit time, and increased fecal bile acid excretion. Although calcium balance was maintained, change from the low to the high protein diet altered the calcium excretion route. The diet with wheat fiber caused a negative calcium balance. Thus, meat protein does not seem related to bowel cancer through influence on stool weight, transit time, or total fecal bile acid excretion.
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