8. Cassava
Cassava is a starchy tuber which provides a few important nutrients like fiber, phosphorus, calcium, and riboflavin, and also contains small amounts of iron and vitamin C. It’s not advisable to consume large amounts of cassava since it may cause cyanide poisoning, but also because it has a high amount of nickel in it – about 0.47 µg/g.
9. Corn Flour
Corn flour, or cornstarch, is widely used as a thickening agent for sauces and soups, and is also a main ingredient in many desserts. While it is mostly made of carbohydrates, it is gluten-free, and makes an excellent substitute for wheat flour and other types of flour. But for a nickel-allergic person, it’s probably worth going for the flours with gluten instead, as corn flour can contain around 1.05 µg/g of nickel. Compared to the other foods in this list, that’s pretty high, and it would probably be best to stay away from it entirely.
