Resist the urge to bustle and putz. Give yourself frequent chances to actually hear yourself think, and to enjoy your surroundings. Walk, don't run. A mile of walking burns about as many calories as a mile of jogging, and slowing down your pace will soothe your psyche.
Prevention is the cheapest and best health insurance.
Take care of your body by eating and sleeping right, and stop smoking. Stop equating the amount of fun and pleasure you get with the amount of money you spend to get it. Sit down and make a list of 25 things you like to do that cost little or no money, and keep it where you can see it every day. Understand and practice the economy of laziness. The next time you find yourself drawn to the mall to shop for more stuff, call or write a friend you've lost touch with instead.