Iron cookware is much more beneficial to the human body than cookware of other materials, but if used improperly, the iron content in the diet will be too much, but it will be harmful to health. In general, it is sufficient to take 15 to 20 mg of iron in an adult's daily diet. Excessive intake of iron, one is damage to the pancreas, causing insufficient insulin secretion, leading to iron-induced diabetes; second, damage to the liver, causing rust liver disease.