23 Surprising Foods You Should Never Eat Raw

Raw green beans can cause stomach issues

While raw green beans aren't necessarily poisonous, Geerts pointed out that, when uncooked, "they can contain higher levels of lectin," a protein that binds into sugar. Lectin can cause digestive issues, however, if you blanch green beans — boil them followed by submerging them in cold water — Geerts said you can make them safer to consume by lowering the level of lectin.