Speaking of iron . . . I read once that “iron overload” is a modern problem, sometimes a serious problem for men and post-menopausal women. The hypothesis is that our ancient ancestors lost enough blood to internal parasites that excess iron was never a problem, even with all the meat / organs in their diet.
I read once that “iron overload” is a modern problem
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I think that’s correct and supported by the evidence in scientific journals.
If someone’s blood ferritin is more than 100 ng/ml, the person will typically benefit from donating blood. If blood ferritin is less than 70 ng/ml, the person has an iron deficiency.