Foods you should never heat again

Breast milk
Microwaves do not heat evenly. Some parts may seem cool or at the right temperature, but others may be too hot and cause burns.

Rice
This is because it contains spores of Bacillus cereus, a bacteria that can cause food poisoning, and can survive during cooking.

These foods should not be reheated in the microwave because they lose nutrients, change their composition, texture, and flavor, and can even cause food poisoning.