Cereals run around 5 mg iron for a bowl [0]. A pan is about 1 kg (a good cast iron one could be much heavier). That's enough for 200,000 bowls of cereal. Even

Cereals run around 5 mg iron for a bowl [0]. A pan is about 1 kg (a good cast iron one could be much heavier). That's enough for 200,000 bowls of cereal. Even if you reckon the pan is degraded enough to be obviously useless after losing 5% of its weight, that would require you to use it every day for 30 years, not "a handful of cooks". [0] https://www.haemochromatosis.org.uk/breakfast-cereals-and-their-iron-content https://www.haemochromatosis.org.uk/breakfast-cereals-and-th...