If storage conditions are appropriate, overnight vegetables are generally edible. If the storage conditions are not reasonable, all overnight vegetables are not edible.
Whether or not you can eat the food overnight and whether the storage conditions are reasonable, if the storage conditions are appropriate, overnight leftovers can usually be eaten, some people think that overnight vegetables contain nitrite, there is the possibility of cancer, but the storage of reasonable overnight vegetables in the nitrite content is generally far below the food requirements of the standard, and will not affect your health.
However, if the storage conditions of overnight vegetables are not reasonable, it is easy to breed bacteria, mold and other microorganisms, and may even lead to food poisoning. In this case, overnight vegetables should not be consumed again to avoid affecting health.
It is recommended to eat more fresh food and less overnight food. If there are too many leftovers, they need to be stored reasonably.