Classic dishes like beef stew with potatoes and Di San Xian are common on the dining tables of many households. Many people boil potatoes with their skins on, thinking that high temperatures will solve all the problems. This is not the case. Potatoes contain a substance called "solanine" to resist pests and diseases. The skin of the potato has a higher content of solanine, and when it accumulates in the body to a certain extent, it can cause poisoning. Potatoes with green skins or sprouts contain even more solanine, and excessive consumption can cause a series of gastrointestinal reactions such as nausea and vomiting. Therefore, potatoes must be peeled before cooking.
Sweet potatoes are nutritious but are alkaline foods, and eating too many can cause heartburn. The skin of sweet potatoes contains more alkali, and eating sweet potatoes with their skin on often can cause gastrointestinal discomfort. Furthermore, sweet potato skins with brown and black-brown spots may be infected with "black spot disease," and consumption can lead to poisoning.
Water chestnuts are sweet, crispy, and refreshing, a favorite of many. However, the skin of water chestnuts may contain parasites such as liver flukes. Eating unwashed water chestnut skins can also lead to illness.
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Although ginkgo has many benefits, it is slightly toxic and should not be eaten in excess. The skin of the ginkgo fruit contains toxic substances such as "ginkgolic acid," and excessive consumption can damage the central nervous system and cause poisoning. When eating, not only should the inner skin be removed, but even the cooked ginkgo flesh should not be consumed in excess.
In addition, due to the large use of chemical fertilizers today, there is serious nitrate pollution in fruits and vegetables. Therefore, it is recommended that you peel fruits and vegetables whenever possible. Especially for fruits and vegetables like apples, pears, and grapes, which are cultivated for longer periods and have better taste, their skins often have many residues of microorganisms, pesticides, and more. Therefore, it is not worth risking your health for a little bit of nutrition.