Neurogenesis

Reason #398 why I need to exercise more: Neurogenesis.

"As you get older, your brain gets smaller, and one of the areas most prone to this shrinkage is the hippocampus. (This can start depressingly early, in your 30’s.) Many neurologists believe that the loss of neurons in the hippocampus may be a primary cause of the cognitive decay associated with aging."

Sweeeet. Stupid 30s.