Iron overload and the HFE gene

Iron deficiency is common and well known, so the instinct is that iron is something to top up. But for a meaningful minority of people, the body absorbs and stores too much iron, and that is its own serious problem.

Iron is essential, until there is too much

Iron carries oxygen in your blood and is genuinely essential. The body, however, has no active way to excrete excess iron, so absorption has to be tightly controlled. When that control fails, iron accumulates in organs.

HFE controls iron absorption

The HFE gene regulates how much iron you absorb from food. Variants such as C282Y and H63D impair that control and underlie hereditary haemochromatosis, in which the body steadily over-loads with iron over years.

Why it matters

Excess iron accumulates in the liver, heart and pancreas, where it can cause lasting damage if undetected. For these carriers, the usual “take iron, add vitamin C to absorb more” advice is exactly backwards.

What actually helps

At-risk carriers should avoid iron supplements and high-dose vitamin C taken with iron-rich meals, monitor ferritin levels, and in clinical cases reduce iron through guided blood donation or therapeutic removal. The gene result is a clear, actionable warning.

The science, in depth

HFE C282Y (rs1800562) and H63D (rs1799945), with rs1800730, disrupt HFE-mediated regulation of hepcidin, the master controller of iron absorption, leading to inappropriate iron uptake and progressive parenchymal iron loading characteristic of hereditary haemochromatosis.