out of UC Berkely shows that doing computing with nano magnetic domains could
reduce the energy consumption by a large (million) factor.
The only other advice I have is to cut out drinking anything besides water. Soda is especially bad for you. Anything with high fructose corn syrup in it (most anything you'd get at 7-11 or the like) is tough for your body to digest. If you are out of shape, working out is going to burn a lot of fat. That fat is stored garbage. Your body is going to be working hard to get rid of that garbage. Water will help that process.
In my experience, this is great advice. You can take in an enormous number of calories in soft drinks, sugary coffee drinks etc..
Real computer scientists like having a computer on their desk, else how could they read their mail?