Abstract
To study the inhibitory effects of soybeans on nonheme iron absorption soybeans were grown in hydroponic culture and labelled intrinsically with radioactive iron. Culture conditions were adjusted to produce seeds with high, intermediate, and low phosphate and phytate content. No effect of phosphate/phytate content on iron absorption was observed in radioiron absorption studies in rats. Absorption tests in human volunteers comparing hydroponically cultured low phosphate/phytate beans with moderate phosphate and phytate beans also failed to demonstrate a significant inhibitory effect of the phosphate or phytate. These observations do not support the hypothesis that phytate is the factor in soybeans and soy protein products that reduces iron bioavailability.
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