Potatoes cannot be eaten if they turn green for a long time. There is also a special substance in potatoes called solanine. When potatoes turn green, their content increases. For the potato itself, it can protect itself against bacteria and insects, but for the human body, if it is ingested in excess, it will affect health. This substance is harmful to people's gastrointestinal health. If ingested, it may cause adverse reactions such as nausea and vomiting, and may also cause a series of stomach health problems.

It is normal for potatoes to turn black after peeling. After peeling potatoes, the plant cells inside will come into contact with air and react with oxygen to a certain extent, so the color will turn black, not bad, and can be cooked normally. It is worth noting that potatoes must be cooked before eating. The substances contained in raw potatoes may affect the activity of protease. If eaten raw, it is not conducive to protein's absorption and digestion, and its taste is also poor.

In order to prevent potatoes from turning green and sprouting, it is recommended that you buy less at a time and store them in a dark environment. When eating, you may wish to use potatoes instead of white rice, flour and other staple foods, and at the same time supplement dietary fiber to enhance satiety and help you lose weight. It is recommended to cook, steam and cook at low temperature. If fried frequently, it may produce bad substances.