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 is because bacteria/fungi have established themselves and colonies have grown to the size that their effects on the food become noticeable. If you then eat this food it can make you sick.
Sure, you can cook the food and this will kill the bacteria/fungi, but you can still become sick if you eat this food because they weren’t necessarily what was going to make you sick.
All the time they were present on the food, they were “eating” the food, secreting chemicals and waste into the food. These chemicals (Toxins) are what will make you ill, they’re what gives spoilt food that horrible smell and taste, and they don’t disappear with a little heating as these simple chemicals (relatively speaking) are far more stable than a complex microorganism.
Super ELI5: Microbes have been vomiting and pooping all over your steak, just because you’ve cooked it doesn’t mean your steak isn’t still full of poop.
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