Hundreds of cities underwater... globally.
Many around Japan, then India. Hundreds in the Mediterranean sea, which basically used to be a huge valley once, with a big river flowing to the Atlantic from the middle through present-day Gibraltar, basically an extension to present Nile (and probably other rivers). A long and powerful river. So a cataclysmic event, and the Atlantic flowed into the mediterranean valley - a flood.
Then underwater ruins around pacific islands.
And where-ever else.
Rise and fall of continents, polar shifts, polar relocations, cataclysms, etc.
There have been many floods, some worse than others. There will come new floods. Evolution and conditions on this planet are not calm and steady, never have been that naturally nor manipulatively. And from present day back to the "paleolithic"... the changes in between in all aspects... "paleolithic" means nothing to us, it cannot mean anything. Taking paleolithic as an example of something or anything, when the fact is you really cannot know how it actually was back then, and imitating those presumed (believed) qualities out in present day simply because they are presumed (believed) to be correct, is not smart nor healthy.
In regards to diet and health. Not "paleolithic" but "what works best in present world". Saying paleolithic works best is simply wrong. You may eat raw animals and whatever else and however else, but you are not eating a paleolithic diet, because this isn't paleolithic, nor have we access to paleolithic foods in their paleolithic condition.
