My understanding is that the cells of bacteria and fungi are filled with water enclosed in a balloon. Wouldn’t microwaving then pop the balloons?
In: Biology
When food spoils it usually means that mold and bacteria have started to grow on it. While you can kill these if you apply enough heat for enough time, this won’t destroy the toxins they have produced, and those can still make you ill. In addition, microwaves work over a short time and heat up food unevenly, so there can easily be patches where bacteria survived.
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