[bigbob]

How many centuries did our ancestors survive on diets where bread, beer, and in some areas, potatoes were staples? And yet, here we are...

[TomGuy]

How many centuries did our ancestors survive on diets where bread, beer, and in some areas, potatoes were staples? And yet, here we are...

They also had much less sedentary lifestyles, too.

[Harmless Teddy Bear]

How many centuries did our ancestors survive on diets where bread, beer, and in some areas, potatoes were staples?

They were doing a lot of heavy outdoor work and they died young.

Which was ok. If you reproduce by the time you are 20 then your children are ready to take over by the time you hit 45. You even have a few years to enjoy your grandchildren.

[mlo]

"How many centuries did our ancestors survive on diets where bread, beer, and in some areas, potatoes were staples? And yet, here we are..."

Agriculture has existed for only 10,000 years. We evolved in a pre-agriculture environment, as hunter gatherers, primarily eating animals. That's the biology we evolved with.

Generally speaking humans have been less healthy since they invented agriculture, despite the fact that agriculture led to civilization and wealth.