Can over-exercise decrease longevity?
Over-exercising can have some negative effects on your longevity. A famous study of 17,000 Harvard alumni showed that those who exercised over 3,500 kilocalories a week had a slight increase in death rate as compared to the control group. Researchers postulate that over-exercise leads to an increase in cellular oxidation. This in turn leads to increased free radical formation, some of which can lead to cellular mutation and cancer.
