Cast-iron cookware nutritional and safety aspects

Cast-iron cookware can provide a modest nutritional boost by transferring small amounts of iron into food. Dr. Morey Blinder of the Washington University School of Medicine in St. Louis notes that a pan could add approximately 5 milligrams of iron to a meal, though the exact amount depends on the food type and cooking duration.

Experts emphasize that cast iron should be viewed as a supplement rather than a primary treatment for iron deficiency. The transfer of iron is influenced by factors such as cooking duration and the use of acidic or moist foods, which tend to absorb more iron than dry foods. Newer pans may also release more iron than older, well-seasoned ones.

Improper use of cast iron can pose health and safety risks. Cooking highly acidic foods for extended periods can erode the protective seasoning layer, causing excessive iron to dissolve into food and creating a metallic taste. Furthermore, thermal shock from placing a hot pan into cold water can cause warping or cracking, which creates crevices that may harbor bacteria and grease. To prevent oxidation and rust, users are advised against soaking pans overnight or using harsh detergents and steel wool.