Abstract
Four diets differing in the ratio of polyunsaturated fatty acid (PUFA) to saturated fatty acid (SFA) were consumed by four groups of rats for eight weeks. The PUFA/SFA ratios were 0.02, 0.13, 0.80 and 8.19. An isotope-dilution technique was used to determine true absorption and intestinal excretion of endogenous zinc. No statistically significant differences in true absorption were noted among the groups. Intestinal excretion of endogenous zinc, serum zinc, total cholesterol and HDL-cholesterol concentrations were lowest in the group consuming diets with a PUFA/SFA of 0.13. Liver and kidney zinc concentrations tended to be higher in this same group. For all rats, total and HDL-cholesterol were both significantly related to intestinal excretion of endogenous zinc (positively) and percent true absorption of zinc (negatively). The serum HDL/total cholesterol ratio was positively correlated with serum zinc and liver zinc concentrations. Our results suggest that endogenous cholesterol metabolism influences zinc metabolism.
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