Improving the bioavailability of nutrients in plant foods at the household level

Summary

This review, published in the Proceedings of the Nutrition Society, examines evidence-based household food preparation strategies — including soaking, germination, fermentation, and enzymatic treatment — that can meaningfully reduce dietary inhibitors such as phytate and tannins in staple plant foods, thereby improving the bioavailability of iron, zinc, and other micronutrients. The paper is particularly focused on populations in low- and middle-income settings where reliance on unrefined plant staples is high and micronutrient deficiency is prevalent. Gibson and colleagues assess the relative efficacy and practical applicability of these low-cost interventions at the household scale, situating them within broader dietary diversification and food fortification strategies.

UK applicability

The paper's primary focus is on low-income populations in developing countries where micronutrient deficiency from plant-dominant diets is a pressing public health concern; however, the underlying principles around phytate reduction and mineral bioavailability are relevant to UK dietary guidance, particularly for vegetarian, vegan, and low-income households reliant on wholegrains and legumes.

Key measures

Micronutrient bioavailability (iron, zinc, calcium); phytate and tannin concentrations; phytate:zinc and phytate:iron molar ratios; fractional absorption estimates

Outcomes reported

The paper reviews the extent to which household-level food processing and preparation techniques — such as soaking, fermentation, germination, and milling — can reduce antinutrient concentrations and improve the bioavailability of key micronutrients (including iron, zinc, and calcium) from plant foods. It assesses the practical feasibility of implementing such strategies in low-income, plant-food-dependent populations.

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