Authors : C. Yuangklang , Th. Wensing , A. G. Lemmens , 2 X. M. Fielmich-Bouman , S. Jittakhot and A. C. Beynen
Abstract: The interaction of dietary calcium, phytate and zinc was studied in relation to fat digestion in rats. It was hypothesized that supplemental zinc would nullify the phytate-mediated antagonism of the calcium-induced inhibition of fat digestion. Under in-vitro conditions, the addition of zinc sulphate to a sodium phytate and calcium phosphate containing solution reduced the recovery of bile acid in the supernatant. Rats were fed a diet either in low calcium, high in calcium, high in calcium plus added phytate or high in calcium plus phytate and extra zinc. Addition of phytate to the diet lowered food intake and body-weight gain, but supplemental zinc counteracted these effects. Supplemental zinc in the high-calcium, phytate containing diet increased fecal bile acid excretion, but left fat digestion unchanged. It is concluded that the present data are at variance with the earlier observed negative relationship between fecal bile acid excretion and apparent fat digestibility.
C. Yuangklang , Th. Wensing , A. G. Lemmens , 2 X. M. Fielmich-Bouman , S. Jittakhot and A. C. Beynen , 2005. Interaction of Dietary Phytate, Calcium and Zinc in Relation to Fat Digestion and Bile Acid Excretion in Rats . Journal of Food Technology, 3: 188-191.