Potatoes contain alkaloids, and the longer they are stored, the higher the alkaloid content of potatoes. Excessive consumption of potatoes stored for a long time can affect the normal development of the fetus and lead to fetal malformation. Of course, people vary greatly from person to person, and not everyone will have abnormalities after eating, but pregnant women had better not eat.

If the potato skin turns green, it means that the content of solanine is high. At this time, you must be careful when eating potatoes. Not only do you need to peel, but you also need to cut off some pulp and completely remove the green part. If the green part of the potato skin is large or has sprouted, don't eat such potatoes, otherwise it is easy to get food poisoning.

At the same time, potatoes mainly contain alkaloid glycosides and solanine, which can raise blood sugar, so they are not suitable for diabetic patients. Potatoes contain high potassium and are not suitable for patients with renal insufficiency. Potatoes also contain citric acid, malic acid, quinic acid, succinic acid and oxalic acid, so they should not be eaten by patients with renal tubular injury, because acidic toxins cannot be excreted, which will lead to acidosis.