Fire didn’t kill the germs, it made food easier to digest and more nutritious. This both gave humans more time in the day and also allowed us to divert more resources to our brain.
This is something we gradually figured out from well… someone tried it and it worked and well the tribe that has extra hours and way more nutrition will out compete all other tribes.
Additionally, as we have cooked we have evolved away from uncooked food.
So it had nothing to do with germs.
That being said we did kinda figure out stuff. So the reason beer was so popular in Europe… was well it’s boiled… meaning water down beer was better for you then water that potentially contaminate for example.
People did figure out some healthcare practices but well understanding you were fighting microscopic organisms took awhile
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