Staying Healthy When Working 12 Hours a Day?

dwija asks: "I just got a new job where I just sit in one place all day and work for 12 hours at a stretch. This goes on for 4 days a week and I get 3 days off. The journey to and from my office takes up about 3 hours of my day. I am a little worried now cause i am becoming really weak and I am not as healthy as I used to be. I want to ask others on Slashdot about the kinds of weird times in which they work and what they do to take care of their health and stress."