6. Peanuts

They are not technically nuts, but legumes. They, however, belong on this list because poorly stored peanuts can grow aflatoxins. This is a toxic mold that’s known as a carcinogen. More common in hot, humid climates with bad storage practices, most peanuts are tested and safe, but in case you’re buying raw or in bulk, you should check if they smell fresh and aren’t discolored to make sure they are safe to be consumed.