Abstract
Changes in serum zinc levels after oral zinc administration was used as an index of zinc absorption. Ten adult males received a single dose of zinc gluconate on 5 separate occasions, either alone (control) or with 1 of 4 aifferent soybean treatments. The soybean treatments consisted of a high-fiber, high-phytate treatment (ground soybeans); a high-fiber, low-phytate treatment (dephytinized ground soybeans); a low-fiber, high-phytate treatment (tofu); and a low-fiber, low-phytate treatment (dephytinized tofu). The dephytinized soybean treatments yielded significantly higher postingestive serum zinc values than did the non-dephytinized treatments whereas no differences were observed between the high- and low-fiber treatments. These data suggested zinc absorption is more inhibited by soy phytate than by soy fiber.
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