Iron

"The medical profession has even coined the term ‘rusty brains’ to describe iron overload’s role in Alzheimer’s… Cleaning out ‘rust’ from the brain could be a way to slow and even prevent degenerative disease." - Georgi Dinkov

"Iron is a potentially toxic heavy metal; an excess can cause cancer, heart disease, and other illnesses. Iron causes cell aging." - Ray Peat

"The harmful effects of iron-produced free radicals are practically indistinguishable from those caused by exposure to X-rays and gamma rays; both accelerate ageing and degeneration." - Ray Peat

“A deficiency of copper causes our tissues to retain an excess of iron, so foods such as shrimp and oysters which contain abundant copper should be used regularly.” - Ray Peat, Iron's Dangers