Effects of Soy Milk and Bifidobacterium Fermented Soy Milk on Lipid Metabolism in Aged Ovariectomized Rats
KIKUCHI-HAYAKAWA, Hiroko | ONODERA, Norie | MATSUBARA, Satoshi | YASUDA, Emi | CHONAN, Osamu | TAKAHASHI, Rie | ISHIKAWA, Fumiyasu
The effects of soy milk and fermented soy milk on lipid metabolism were studied in aged ovariectomized rats. Twenty 8- mo-old Wistar rats were randomly assigned to four treatment groups: sham-operated+control diet (sham-C); ovariectomized (OVX)+control diet (OVX-C); OVX+soy milk diet (OVX-SM); and OVX+fermented soy milk diet (OVX-FSM). The rats were fed on these diets for 6 weeks. Ovariectomy induced an increase in the plasma cholesterol level by 40%. The plasma total cholesterol level of the OVX-FSM rats was decreased by 20% compared to that of the OVX-C rats. The plasma total cholesterol level of the OVX-SM group was not significantly different from that of the OVX-C and sham-C rats. The plasma triglyceride level of the OVX-FSM rats was lower than that of the sham-C rats. The liver cholesterol content in OVX-SM and OVX-FSM rats was lower than that of the OVX-C rats. The liver triglyceride contents of the sham-C, OVX-SM, and OVX-FSM groups were lower than that of the OVX-C group. Fecal steroid excretion did not differ among the groups. Ovariectomy decreased the uterus weight. The OVX-SM and OVX-FSM groups had the same uterus weights as those of the OVX-C group. Thus, the diet including fermented soy milk prevented the cholesterol elevation induced in rats by ovarian hormone deficiency.
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