Earlier this year these researchers found that in addition to growing new neurons, exercise doubled blood flow to the brain. A study published last year by researchers at the University of Illinois reported that just walking for three hours per week for only three months caused so many new neurons to grow that it actually increased the size of people’s brains. (article - Newsweek/MSNBC)

good lord, if thats the case, my head might EXPLODE by the time i manage to lose all my excess blubber...