Fritjof Capra, Physicist (2008)
What is the difference between a rock and a rose? Metabolism. What is the difference between an obese person and an athlete? Metabolism.
Metabolism is speed. Too little speed, makes a sloth-like existence. Too much speed creates inflammation, and a body's anger response kicks in. Finding one's own happy pace of life is a matter of finding what gives joy and strength, and what leaves a person with enough energy to share and spare.