Texture. Once sweet potatoes turn mushy, you can be sure that they have gone bad. Usually, their ends become soft before turning brown or black. As soon as these parts spoil, the flavor of the whole tubers will be affected.
When should you not cook sweet potatoes?
As sweet potatoes begin to spoil, they will shrivel (like the one on the photo above) as they lose moisture. The veggie will then become mushy and turn brown or black. Do not eat sweet potatoes once they have begun to shrivel, and certainly not past this point.
Are old sweet potatoes safe to eat?
When stored correctly, the sweet potatoes should last for a month or two before they begin to go bad. They are such a useful food to store in your pantry.
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