1, sweet potato is moldy and can't be eaten. The main components of sweet potato are starch and water, which means that as long as sweet potato is moldy, mold can't stay in the moldy part, and it will definitely move to the moldy part. Generally, after being infected with mold, there will be a lot of mold on its surface and inside. Although sometimes you may only see mold in a certain part, in fact, mold has infected the whole sweet potato. Even if the moldy part is cut off, such sweet potatoes will be infected. Eating moldy sweet potatoes is harmful to your health, which will cause diarrhea immediately and food poisoning in severe cases.

2. Sweet potatoes can still be eaten after germination, but if the skin is brown or black spots, it is not recommended to eat them, because the black spots are caused by sweet potato pollution. This black spot fungus removes toxins and contains sweet potato ketone and sweet potato ketone alcohol, which can make sweet potato taste harder and bitter, and it will also be harmful to human health.