Don't forget the basics. Less diet and more lifestyle change. And walking is really good exercise that also helps you stay aware and engaged in the surrounding neighborhood:

http://scienceblogs.com/neurotopia/2010/05/walking_and_obesity_the_city_l.php

A friend of mine took up walking and was surprised to find out he had a small hobo jungle set up on the far side of his property. Easy to overlook such details if you stay in a vehicle.

He is pretty cool with the homeless there but had to run off the ones that were loud, drugged out, destructive, or potentially violent. He is okay with homeless there as long as they are higher class hobos who are well behaved.