I grow at least half of my fruits and veggies, and but most of the rest from local farmers who use biodynamic organic methods. I can't always get what I want! But that is a small price to pay for my excellent health. I go to grocery stores very rarely, to get things that cannot be grown here, such as lemons and coffee.
Gardening is also great exercise! Gets me outdoors regularly, has me thinking about other living things all the time.