This article is for general informational purposes and is not a substitute for professional medical advice. Always talk to a qualified health provider about your specific situation.
Iron deficiency is one of the most common nutrient shortfalls worldwide, and it can occur even in people who eat what looks like a reasonably balanced diet, because absorption — not just intake — plays a major role.
Who’s most at risk
- Menstruating individuals — regular blood loss increases iron needs substantially compared to non-menstruating adults.
- Pregnant people — iron needs roughly double during pregnancy to support increased blood volume and fetal development.
- Vegetarians and vegans — plant-based (non-heme) iron is absorbed less efficiently than the heme iron found in meat, so requirements from plant sources are often estimated higher.
- Endurance athletes — some research points to increased iron losses from prolonged high-intensity training, through mechanisms including minor gut bleeding and a exercise-related hormone that temporarily reduces iron absorption.
Heme vs non-heme iron
Heme iron, found in red meat, poultry, and fish, is absorbed at a notably higher rate than non-heme iron from plant foods like lentils, spinach, and fortified cereals. This is the main reason vegetarian and vegan diets are often planned with a higher total iron intake target than diets that include meat.
A pairing trick that actually helps
Vitamin C meaningfully improves non-heme iron absorption when eaten in the same meal — pairing lentils with bell peppers or tomatoes, or having a glass of citrus juice alongside a plant-based iron source, is a simple, well-supported way to boost how much iron your body actually absorbs from a plant-based meal.
What to watch for
Fatigue, pale skin, and shortness of breath on exertion are classic signs of iron-deficiency anemia, but mild deficiency often causes no obvious symptoms at all. If you fall into one of the higher-risk groups above, a simple blood test can confirm whether supplementation is actually needed — self-supplementing with iron without a confirmed deficiency isn’t advisable, since excess iron can cause its own problems over time.