The Fall of the Soviet Union in Rare Pictures, 1991

[harm_less]

A big problem is the amount of mental stimulation that modern life presents that results in elevated cortisol levels. Ongoing background stress has a lot of health and behavioural problems to answer for. Stress is a big contributor to illness which is probably why disease can be broken down to dis-ease.

And being in a state of fight or flight isn't a great base for making wise or well considered decisions.