In med school, I took an elective called "Stress", foolishly thinking I was going to learn about meditation and yoga. Instead the professor spent 6 weeks proving that being poor or a minority literally destroys your health on a molecular level, and I think about that every day.

cc: @JWLuiza that class was really ahead of its time. Everyone should have to take it.

Stress, Immune Function, and Health: The Connection https://www.amazon.com/dp/0471241814/ref=cm_sw_r_cp_api_i_dIiUEbR44Q36X. This is the book he wrote, I have no gain in the promotion of it. It was just an amazing class!

For those asking: I found 8 of his easy-to understand lectures on the effect of stress on your health (and tips for how to cope with it) organized online for free! https://www.alephne.org/templates/articlecco_cdo/aid/4713968/jewish/Stress-Management-Video-Presentation.htm