Who is saying that beer isn't food?
Until the 19. century beer-soup has still been common in everyday meals.
History
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For a long time, weak alcohol was more a form to make water safe to drink than a way to get buzzed.
My understanding is that's not really true. Low alcohol content drinks can spoil just as easily as water or anything else. It was a, slightly, inebriating calorically dense drink, and it was drank for that reason
You're both right depending on the region and time. Weak Beer being used when water wasnt necessarily safe was a thing, it was also a way of getting a second run out of your grain after brewing stronger beer. Small Beer as the weaker sruff was called was still around 3% which is at least adequate to make it spoil a lot slower than still water. That being said your Beer for getting drunk was brewed pretty strong. This is all based mostly on medieval western Europe. Beer is older than recorded history so there is a lot of times and places where for your mileage to vary but it does seem like weaker second run beers were used when the water sucks but also cause it was a flavored beverage.
As far as i know it was safe to drink but mostly because it had been boiled and put in a keg, not because of the alcohol.
Yes
The human brain needs beer
At the very least, my human brain needs beer

no surprise that humanity's first and biggest mistake was caused by alcohol intoxication 🙄
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy:
