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Dietary Fiber Sources Lower Blood Cholesterol In C57BL/6 Mice^{1, 2,}

Department of Nutrition and Food Sciences, Texas Woman's University, Denton, TX 76204

Five sources of dietary fiber were compared for their effect on blood and liver cholesterol. The effects of soybean fiber, rice bran (full fat), oat bran, barley bran and mixed bran on total blood cholesterol concentrations and liver cholesterol concentrations were measured in beef-fed C57BL/6 male mice. Each diet contained cooked beef, beef tallow, corn starch and 7% dietary fiber from one of the five fiber sources. A control group consumed a fiber-free diet. Dietary cholesterol was provided by the beef and beef tallow only. The experimental diets were fed for 3 wk; blood and liver were collected when the mice were 18 wk old. The liver cholesterol concentration in the rice bran-fed group was the lowest of the six diet groups and was significantly different than concentrations in the oat bran-fed group and the barley bran-fed group (P < 0.05). The oat bran, mixed bran, and barley bran did not significantly lower blood cholesterol in the mice. Both the soybean fiber and rice bran diet groups had significantly lower total blood cholesterol than did the fiber-free controls (P < 0.05). The soybean fiber group also had significantly lower blood cholesterol than the mixed-bran group.

KEY WORDS: • dietary fiber • cholesterol • soybean fiber • rice bran • mice

¹ Supported by a grant from the Advanced Technology Program, Texas Higher Education Coordinating Board.

² Presented in part at the 74th Annual Meeting, Federation of American Societies for Experimental Biology, April 4, 1990 [Hundemer, J., Nabar, S. & Forman, L. (1990) Fiber sources lower blood cholesterol in beef-fed C57BL/6 mice. FASEB J. 4: A528 (abs.)].

³ To whom correspondence should be addressed.

Manuscript received 13 September 1990. Revision accepted 6 March 1991.