If a person eats meat every day, about 8-10 oz of steak, but takes no iron supplements, could he end up with hemosiderosis or hemochromatosis?

Not likely: Hemochromatosis is a genetic disorder that causes too much iron & deposits it in tissues. Hemosiderosis is not genetic & can be caused by anything that causes excessive amounts of iron to deposit in cells. Common causes having a lot of blood transfusions, alcoholism, taking too many iron supplements. Eating too much could cause it, so possible but not likely. 8oz steak-6mg, recom. Daily iron-10mg.

Too much meat : I would be more concerned about your cholesterol and triglyceride levels as well as your risk of gout and kidney damage. You should have lab tests to monitor your levels.

Not likely, but...: Once iron gets absorbed, it stays in-unless lost through blood loss (minimal losses in sweat, stool). Hemochromatosis is genetic-needs a double hit (one from each parent); people absorb about an extra mg of iron daily, every day. Over time that can add up, fills the stores (bone marrow) and fills other organs (liver, pituitary, testes, heart, etc). Meat sources better abs than plant; alcohol adds.

Need the gene: You won't get sick from iron overload just from a meat-rich diet unless you have the gene to be able to do so. If you do, it's easy to manage. Gauchos have lived on only meat and seem to suffer no ill effects. If you are reading stuff by militant vegetarians, put it down and trust an evidence-based physician or dietician for accurate information. Best wishes.