Reddit mentions of Survival of the Sickest: The Surprising Connections Between Disease and Longevity (P.S.)

Copying from my other comment:

Ok so there was a really interesting book I read about biology once that talked about how bloodletting might have worked at one point, because people with hemocromatosis lived through the Black Death at a MUCH higher rate than others, so after like a third of western Europe's population was wiped out a large portion left had hemocramatosis. It was a such an interesting book- talked about different biological explanations for pop culture, current events, politics, etc. I'm going to try and find it and will edit when I do.

EDIT: Found it! Would recommend. I read it years ago in high school and still think about every once in a while - https://www.amazon.com/Survival-Sickest-Surprising-Connections-Longevity-ebook/dp/B000OI0E6I