The disconnect between what our bodies are built for and the lives we're living in 2015 is the source of many modern diseases. Daniel Lieberman [1] has an excellent book on the matter called The Story of the Human Body: Evolution, Health and Disease [2]. Reading it was a deep realization for me that I needed to change my way of life and forced me to eat better (more fruits, vegetables, slashing everything processed from my diet) and exercise more.

[1] http://en.wikipedia.org/wiki/Daniel_Lieberman [2] http://www.amazon.com/The-Story-Human-Body-Evolution/dp/0307...