# Phytic Acid in Legumes: How It Affects Your Mineral Absorption

> Legumes are healthy, but phytic acid can inhibit the absorption of important minerals. How to reduce it easily and why this is especially relevant for vegetarian diets.

Legumes are an excellent source of plant protein and fiber, but the phytic acid they contain can impair the absorption of important minerals. Many people are unaware of this issue, even though it can significantly affect the bioavailability of nutrients. It is important to understand how phytic acid works and which simple methods exist to minimize its effect.

## Phytic Acid and Its Effect on Minerals

Phytic acid, also known as phytate or inositol hexaphosphate (IP6), is a natural compound found in the seed coats of grains, legumes, nuts and seeds. Its primary function in the plant is phosphate storage. For humans, however, it poses a challenge, since it binds **divalent mineral cations** such as zinc, iron, calcium, magnesium and manganese in the gut. These bound complexes are poorly soluble and can hardly be absorbed by the body, resulting in reduced mineral uptake.

## Strategies for Reducing Phytic Acid

There are several effective methods to reduce the phytic acid content in legumes and thereby improve mineral absorption. **Soaking** for 8-12 hours can lower the content by 10-50%, especially if the water is slightly acidified and warmed. **Cooking**, particularly in a pressure cooker, also breaks down phytic acid. The most effective method is **sprouting**, since it activates plant phytases that enzymatically break down phytic acid. **Fermentation**, as in the production of tempeh or sourdough, also significantly reduces phytic acid content.

## The Role of Vitamin C and Positive Effects

Combining phytic acid rich foods with **vitamin C** (ascorbic acid) can considerably improve iron absorption, even in the presence of phytic acid. Examples include lentil soup with lemon juice or chickpeas with bell peppers. Despite its mineral binding properties, phytic acid also has positive sides: it acts as a strong **antioxidant** and can bind iron ions in cells, reducing oxidative damage. Studies also point to a link between a phytic acid rich diet and a reduced risk of colon cancer.

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## Frequently Asked Questions

**How does phytic acid affect digestion?**
Phytic acid binds minerals in the digestive tract, making them harder for the body to absorb. It is not digested itself and can cause digestive discomfort in larger amounts.

**Are all legumes equally rich in phytic acid?**
The phytic acid content varies depending on the type of legume and growing conditions. In general, all legumes contain phytic acid, but the concentration can differ.

**Can I eliminate phytic acid completely?**
Complete elimination of phytic acid is hardly possible with household methods. The goal is to reduce the content as much as possible in order to optimize the bioavailability of minerals.

## Sources

Hurrell RF & Egli I (2010), Am J Clin Nutr - Iron bioavailability and dietary reference values.
Lönnerdal B (2010), J Nutr - Dietary factors influencing zinc absorption.
Duhan A et al. (1989), Plant Foods Hum Nutr - Phytic acid content of chickpeas and black grams.
Hefnawy TH (2011), J Anim Vet Adv - Effect of processing on phytate content in legumes.

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