Eat in a manner commensurate with your activity level. I might be lucky in this regard, but I simply don't get hungry when I'm not sufficiently active. Drinking lots of water might have something to do with that, but I'm really not sure.<p>Make being active a part of your daily experience: walk, run, or bike to your office. Get a gym membership nearby so you can clean up before going to work. Go back to the gym to do some lifting on your lunch breaks Mondays, Wednesdays, and Fridays. This will perk you up in the middle of the day and keep you from falling into a post-lunch food coma. After your day at the office is over, you've got another burst of activity awaiting you in order to get home.<p>Diversify from workout routines and take time off. Block six to ten weeks for the routine, then take a break for two weeks and try out informal, social exercise (pickup sports, dance classes). Go hiking, do yoga, or catch up on your social life in an active way, like a pub crawl or one of the boozy bicycle group tours.