As an illustration, current regulations for GM foods, if applied to non-GM products, would bar the sale of potatoes and tomatoes, which can contain poisonous glycoalkaloids; celery, which contains carcinogenic psoralens; rhubarb and spinach (oxalic acid); and cassava, which feeds about half a billion people, but contains toxic cyanogenic alkaloids. Foodstuffs like soy, wheat, milk, eggs, mollusks, crustaceans, fish, sesame, nuts, peanuts, and kiwi would likewise be banned, because they can cause food allergies.