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Soybean phytate content: effect on calcium absorption.

R P Heaney¹, C M Weaver, M L Fitzsimmons

¹Creighton University, Omaha, NE 68178.

The American Journal of Clinical Nutrition

|March 1, 1991

Summary

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Calcium absorption from soybeans is significantly impacted by phytate content. Lower phytate soybeans allow for greater calcium absorption compared to high phytate soybeans, but milk absorption remains comparable.

Area of Science:

Nutrition Science
Human Physiology

Background:

Phytates in plant-based foods can inhibit mineral absorption.
Understanding calcium bioavailability from different food sources is crucial for bone health.

Purpose of the Study:

To compare calcium absorption from soybeans with varying phytate levels and from milk.
To quantify the effect of phytate on calcium bioavailability.

Main Methods:

Intrinsically labeling soybeans with 45Ca to trace absorption.
Measuring fractional calcium absorption in normal women from high-phytate soybeans, low-phytate soybeans, and milk.
Using a standardized calcium load (2.45 mmol) for all sources.

Main Results:

Fractional calcium absorption was 0.310 from high-phytate soybeans, 0.414 from low-phytate soybeans, and 0.377 from milk.

Related Experiment Videos

A significant difference (P < 0.001) in calcium absorption was observed between the two soybean phytate levels.

Calcium absorption from low-phytate soybeans was higher than from milk.

Conclusions:

Soybean phytate content significantly reduces calcium absorption.
Low-phytate soybeans offer improved calcium bioavailability compared to high-phytate varieties.
Dietary strategies should consider phytate levels for optimizing calcium intake from plant sources.