Nickel is a trace element found in many foods, and it can cause allergic reactions in some people. If you have a nickel allergy, you should avoid the following high-nickel foods: 1. Flour and Grains: Wheat flour and other grains contain high levels of nickel. 2. Seeds: Sunflower seeds, sesame seeds, and alfalfa seeds have moderate amounts of nickel. 3. Seafood: Shrimp, mussels, and crawfish are high in nickel. 4. Legumes: Certain legumes contain high levels of nickel. 5. Vegetables: Green vegetables and some other vegetables have notable nickel content. 6. Fruits: Figs, pineapples, prunes, and raspberries are more likely to trigger a reaction. 7. Chocolate: Cocoa beans have high nickel content, so avoid chocolate and cocoa drinks. If you are sensitive to nickel, your doctor may recommend a low-nickel diet. Some alternative foods with little to no nickel include corn-based products, non-seafood meats, most fruits, polished rice, and root vegetables like potatoes and carrots.