Where your DNA places you among other people, and the studies behind it.
Not tailored to your result, and not medical advice
Pair Plant Iron With Citrus: Heme iron from meat is absorbed at roughly 15-35%, while non-heme iron from beans, lentils, grains and leafy greens is often absorbed at under 10%, and what sits on the plate alongside it changes that considerably. In the human studies collected in this review, raising the ascorbic acid content of a meal lifted iron absorption from about 0.8% to 7.1%, so peppers, citrus, tomatoes or broccoli eaten in the same meal work in your favor. Phytate in whole grains and legumes pushes the other way, cutting absorption by 18% at low levels and up to 82% at high levels, and calcium in one study lowered absorption from a single meal from 10.2% to 4.8%. Eating a high-phytate diet regularly appears to lessen some of that inhibition over time. ACS Omega (PMC)
Keep Tea Away From Meals: Polyphenols bind non-heme iron in the gut and block its uptake. In a controlled human study that measured iron absorption from bread meals using radioisotopes, black tea cut absorption by 79-94%, peppermint tea by 84%, cocoa by 71% and camomile by 47%, and the effect tracked the polyphenol content of the serving. Coffee's phenolic acids inhibited absorption as well, and adding milk made little difference. Taking these drinks between meals rather than with them keeps the inhibition away from the meal that carries the iron. British Journal of Nutrition (PubMed)
Go Easy On Alcohol: Alcohol interferes with the hormone that governs how much iron the gut lets in. It down-regulates hepcidin, and lower hepcidin raises expression of the iron transporters DMT1 and ferroportin, which increases absorption; even mild to moderate drinking has been associated with a higher prevalence of iron overload. Iron and alcohol each generate oxidative stress and lipid peroxidation in the liver, and higher hepatic iron content is associated with greater mortality from alcoholic cirrhosis. Heavy drinking has been reported to worsen liver injury in hemochromatosis patients who carry two copies of the HFE C282Y variant, so the two exposures appear to act together. World Journal of Gastroenterology (PMC)
Weigh Frequent Blood Donation: Every whole blood donation removes iron, and in donor cohorts it swamps almost everything else. In the REDS-II RISE study of 2,425 donors, 16.4% of frequent male donors and 27.1% of frequent female donors had absent iron stores, with iron-deficient erythropoiesis in 48.7% and 66.1% respectively. Compared with first-time donors, the odds of absent iron stores rose from 5.3 times at up to four donations in two years to 18.9 times at ten or more, and the same pattern for iron-deficient erythropoiesis ran from 14.0 up to 50.5; younger and lighter donors were also more likely to be depleted. The honest answer here is that food does not do much, since beef and liver intake had little to no effect after adjustment and the authors concluded that these foods do not meaningfully change donor iron status. Transfusion (PMC)
Ask About Iron Blood Tests: A genetic result is not a diagnosis, and the gap runs both ways. In UK Biobank, 12.1% of male C282Y homozygotes had a hemochromatosis diagnosis at a mean age of 57, rising to a cumulative 56.4% by age 80, while for women the figures were 3.4% and 40.5%; liver disease reached 20.3% in male homozygotes against 8.3% in people without HFE variants. Most people in that cohort carrying the genotype had never been diagnosed in the community, yet joint replacement was still more common in them than in people without the variants. No diet or lifestyle change tells you where your own iron actually sits, whereas blood tests can, so persistent fatigue, joint pain or abnormal liver results are worth raising with a clinician. BMJ Open (PMC)
How much of this is genetic?
Genetics explains 30% of why people differ in this trait. The rest is environment, daily habits and chance.
Heritability estimate: Approximate; twin and GWAS heritability estimates for serum iron and ferritin (representative GWAS: Benyamin et al., Nat Commun 2014)
Background and further reading
Iron metabolism is the set of processes by which the body absorbs iron from food, transports it in the blood on the protein transferrin, uses it (mainly to build the hemoglobin in red blood cells), and stores the surplus as ferritin, largely in the liver. The system is finely balanced because iron is essential but also potentially harmful in excess. Because the body has no active way to excrete iron, absorption in the small intestine is the main control point, governed chiefly by the liver hormone hepcidin. Iron status is commonly assessed with blood markers such as serum ferritin, serum iron, transferrin, and transferrin saturation.
Genetic Basis: Common variants influence where a person tends to sit on the spectrum of iron stores. The best-known gene is HFE: the C282Y and H63D variants reduce hepcidin signalling and are the main drivers of hereditary hemochromatosis, the most common inherited cause of iron overload in people of European ancestry. At the opposite end, variants in TMPRSS6, which normally dampens hepcidin, are associated with lower iron and a tendency toward iron-deficiency anemia. Genome-wide studies have added further loci in genes such as TF (transferrin), TFR2, and the ferritin genes. This polygenic score aggregates such common variants; it reflects a tendency, not a diagnosis, and does not capture the rare high-penetrance mutations that clinical testing looks for.
Non-Genetic Factors: Everyday iron status is shaped strongly by factors outside of DNA. Dietary iron intake matters, and the well-absorbed heme iron in meat is taken up more readily than the non-heme iron in plants; vitamin C enhances non-heme absorption while tea, coffee, and calcium reduce it. Blood loss is a major influence, so menstruation, pregnancy, and blood donation lower iron stores, whereas chronic inflammation and some liver conditions can raise ferritin independently of true iron stores. Alcohol intake can increase iron absorption. These environmental and physiological factors typically outweigh common genetic variation in determining measured iron levels at any given time.
The published research behind your score, and the variants it draws on.
2 published scores from 2 studies
The iron metabolism score combines 2 polygenic scores drawn from 2 published studies.
These traits are influenced by some of the same genes and variants as this one
Hemoglobin: The oxygen-carrying protein in red blood cells, measured on a routine blood count.
Content updated August 2026.
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