Dietary iron: animal or plant sources, absorption and useful pairings

Heme iron is found exclusively in foods of animal origin, while nonheme iron is found in plant foods and several animal foods. Heme iron is, on average, better absorbed than nonheme iron.

Legumes, nuts, seeds, grains and some leafy vegetables contribute to intake. Meat, poultry, fish, seafood and liver are animal sources. Amounts depend on the food, preparation and portion; a composition table is preferable to a universal ranking.

For another seed comparison, see chia.

Vitamin C supports nonheme iron absorption. Pairing legumes or grains with tomatoes, peppers, cabbage, citrus or other fruit can help build varied meals.

Tannins and some polyphenols in tea and coffee may reduce nonheme iron absorption when consumed with a meal. Phytates, found especially in legumes, grains and seeds, may also limit it. This does not justify removing these foods, which provide other nutrients.

Calcium may also interact in some situations. An effect seen with an isolated meal does not always translate to the whole diet.

There is no single answer. A plant-based diet can contribute iron, but adequacy depends on variety, organisation and individual circumstances. Preferences, culture, budget, availability and digestive tolerance can guide choices.

A plate can combine an iron source, a vitamin-C-rich food and varied preparation. The goal is consistency, not a perfect pairing at every meal.

Growth, pregnancy, blood loss, heavy periods and some absorption problems warrant particular attention to iron status. Persistent fatigue or dizziness alone cannot establish deficiency.