Iron Calculator (Food)

Women of reproductive age, pregnant women, infants and toddlers, vegetarians, and people with gastrointestinal conditions are most at risk. Heavy menstrual periods and poor dietary intake are the most common causes in women. Regular screening and a varied diet help manage risk.

Iron is primarily lost through blood loss (menstruation, injury, or gastrointestinal bleeding), as well as through sweat, urine, and the shedding of intestinal cells. Unlike many nutrients, the body has no active mechanism to excrete excess iron, which is why absorption is tightly regulated.

Vitamin C-rich foods — such as oranges, bell peppers, and tomatoes — significantly boost absorption of plant-based (non-heme) iron when eaten together. Consuming heme iron from meat alongside plant sources also enhances overall iron uptake. Cooking in cast-iron cookware can add small amounts of iron too.

Yes. Calcium in dairy products competes with iron for absorption in the intestine. Drinking milk or consuming cheese and yoghurt with iron-rich meals can reduce how much iron your body absorbs. It's best to separate high-calcium foods from your main iron-rich meal by at least an hour.

Plant-based foods contain non-heme iron, which is far less bioavailable than the heme iron in meat and seafood. The body typically absorbs only 2–10% of non-heme iron compared to 15–35% of heme iron. Vegetarians and vegans are therefore recommended to aim for about 1.8 times the standard daily intake.

Iron supplements are best absorbed on an empty stomach, ideally 30–60 minutes before a meal. Taking them with a glass of orange juice can improve absorption. Avoid taking them with coffee, tea, dairy, or antacids, as these can significantly reduce iron uptake.

With iron supplementation, most people see an improvement in symptoms within 2–4 weeks and hemoglobin levels typically normalize within 2–3 months. However, iron stores in the body may take a further 3–6 months to fully replenish. Always follow your doctor's guidance on duration.

Yes. Excess iron accumulation — known as iron overload or hemochromatosis — can damage the liver, heart, and pancreas. The tolerable upper intake level for adults is 45 mg/day from food and supplements combined. Avoid high-dose iron supplements unless prescribed by a healthcare professional.