The skin of walnut kernel is gray-black, so don't eat it to prevent it from being bad for physical and mental health. The actual reason is that walnut kernel is peeled with organic chemicals such as ethyl acetate. Even if the quality of dried fruit is not affected, it is inevitable to ingest toxic substances left on the shell of walnut kernel when eating, so it looks grayish black and is harmful to physical and mental health after eating.

Suggestion: It is suggested that when purchasing walnuts, you should also choose walnuts with bright skin, and don't buy walnuts with gray-black surface.

It doesn't matter if fresh walnuts turn black and moldy, but some of them are getting better and better. Remember that fresh walnuts should be dried. Fresh walnuts are white, and they will turn black after drying. Some walnuts are essentially black, that is, oily walnuts, and some are moldy and black. If it is moldy and black, it is best not to eat it.

. Walnut kernel, also called walnut, is a green plant of Juglandaceae. Walnut kernel contains rich and colorful nutrient elements, each gram contains protein15-20g, human fat 60-70g and carbohydrate 10g. It also contains calcium, phosphorus, iron and other nutrients and minerals, carotene, vitamin b2 and other nutrients. Walnut kernel often contains human fat, and the main component is fatty glyceride. After eating it, it is not easy to increase cholesterol, but also reduce the digestion and absorption of cholesterol by the stomach. Therefore, it can be used as health food for patients with hypertension and arteriosclerosis. In addition, this vegetable oil can also provide the needs of human brain culture matrix. Nutrients such as zinc and manganese often contained in walnut kernel are the key components of pituitary gland. Eating them regularly is beneficial to supplement nutrients in the brain and brain intelligence.