Non-Heme Iron

Definition

Iron form from plant sources and fortified foods, requiring ferric iron reduction for absorption. Bioavailability is lower but can be enhanced with dietary strategies.

How it works

Non-heme iron, found in plant-based sources and fortified foods, requires reduction from ferric (Fe3+) to ferrous (Fe2+) form before absorption through standard intestinal transporters. This iron form's absorption is significantly influenced by dietary components: enhancers like vitamin C, meat, and fish increase absorption, while inhibitors like phytates, tannins, calcium, and polyphenols decrease it. Absorption rates typically range from 2-20%, substantially lower than heme iron. However, strategic meal planning—such as consuming iron-rich plant foods with vitamin C sources—can substantially improve non-heme iron bioavailability and is particularly important for vegetarians and vegans.

Role

Provides dietary iron from plant sources, requiring optimization strategies for adequate absorption.

Examples

• Lentils
• Spinach
• Fortified cereals
• Beans
• Tofu
• Pumpkin seeds
• Quinoa

Recommendations

Combine plant-based iron sources with vitamin C-rich foods (citrus, tomatoes, peppers) to enhance absorption. Separate iron-rich meals from calcium supplements and tannin-containing beverages for optimal bioavailability.

Key takeaway

Non-heme iron absorption can be significantly improved through strategic dietary pairing with enhancing foods.

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