Usually it will be something that is raw and poisonous, something that will cause damage to the body and cause undesirable side effects if you eat it, you can't eat it.

Sprouted and green potatoes are poisonous and cannot be eaten. Fresh cauliflower is toxic and should not be eaten. The beans and lentils that have not been fried thoroughly are toxic and should not be eaten. Old chicken head (more than 5 years old chicken head) has a big poison, can not eat. Tender fried pork liver, containing toxins, should not be eaten. Eggs, popcorn contains lead, children should not eat. Roasted food can not be eaten, after eating easy to cancer. Rotten ginger is extremely toxic, can necrosis of liver cells, do not eat. Raw soybean oil contains benzene, will destroy the hematopoietic system, do not eat. Long-boiled water contains nitrites, eating is prone to cancer. Too hot food can not eat, easy to burn the digestive tract causing cancer. Uncooked soymilk should not be eaten, and it is easy to be poisoned. Pickled food contains carcinogens and should not be eaten. Baked meat kebabs and fish fillets contain carcinogens and should not be eaten. Persimmon empty serving easy to suffer from gastric persimmon stones, do not eat. Food additives, artificial food, spices, flavors, eggs, instant noodles, lunch meat, fried food should not be eaten.