Iron

Iron is a cumulative toxin whose routine supplementation Ray Peat considered one of the most pervasive and dangerous errors in conventional medicine. 5 Peat argued that the body has no regulated mechanism to excrete excess iron, stating, "You can only shove it in; you can't push it out," which causes tissue concentrations to rise inexorably with age. 9 This progressive accumulation is not benign; free iron is a potent catalyst of oxidative stress, capable of creating lipofuscin, inhibiting cytochrome c oxidase, and damaging pyruvate dehydrogenase, the rate-limiting enzyme for glucose oxidation. 2 Peat linked this age-related iron overload directly to the U-shaped mortality curve, observing that both infants (born with a large prenatal iron surplus) and the elderly share high tissue iron concentrations and correspondingly high rates of cancer and infectious disease. 9

The diagnosis of iron deficiency anemia is, in Peat's framework, a profound and systematic misunderstanding. He insisted that low hemoglobin or red cell count is not biologically reasonable as a primary indicator of iron need, pointing out that toxins like arsenic also stimulate red blood cell production without indicating a deficiency of the toxin. 5 True iron deficiency should be the last-suspected cause of anemia, considered only when specific blood tests show an abnormally low transferrin saturation percentage. 2 Even then, Peat and Dinkov have emphasized that low serum iron and ferritin are frequently not a sign of insufficient dietary intake but of a hypometabolic state that prevents the liver from synthesizing the iron-carrying protein ferritin. 3 Dinkov has written that iron supplements often fail to resolve anemia unless overall nutrition and thyroid function are improved, because without adequate ferritin production, the supplemented iron remains in a dangerously reactive, unbound state. 2

The relationship between ferritin and inflammation further complicates standard blood testing. Peat explained that ferritin is properly an intracellular storage protein, but under stress, inflammation, or injury, cells leak ferritin into the bloodstream. 2 Consequently, a high blood ferritin level can be a marker of generalized inflammation and cellular damage rather than a straightforward indicator of high iron stores, just as low blood iron can paradoxically coexist with iron overload in the liver and bone marrow during high-cortisol states. 2 Dinkov and Roddy have noted that this leakage makes blood ferritin an unreliable surrogate for tissue iron, with Dinkov specifying that the only situation warranting iron supplementation is when low iron saturation and low ferritin are accompanied by high transferrin, and only after verifying adequate thyroid and liver function. 2

Peat’s practical guidance centered on avoidance and strategic inhibition. He advised strictly avoiding foods with added ferrous sulfate or "reduced iron," which are mandated in industrially processed grains and present in unexpected items like black olives. 5 To block the absorption of the iron naturally present in a nutritious diet, he and Roddy recommended consuming coffee and calcium (such as milk) with meals. 7 Peat noted that the copper in shellfish like oysters is protective against iron excess, and that traditional practices like adding milk to tea served to bind and mitigate the harmful effects of reactive iron and tannins. 1 For those with confirmed overload, he acknowledged the value of iron chelation therapies, which have been discussed for decades in the context of infections and cancer, as both pathogens and malignant cells exhibit an avid hunger for freely available iron. 3