Lots of excellent advice on this thread (What I read of it).
Take breaks at work and move around. Spend as much time as you can outside. The time away will recharge you and you'll be more effective when you return.
Concentrate on your meals when you're eating, instead of eating in front of the computer or reading, for instance. You'll be more aware of how the food is affecting you and how much of it you need. If you start to notice that something adversely effects you cut it out of your diet.
Take breaks at work and move around. Spend as much time as you can outside. The time away will recharge you and you'll be more effective when you return.
Concentrate on your meals when you're eating, instead of eating in front of the computer or reading, for instance. You'll be more aware of how the food is affecting you and how much of it you need. If you start to notice that something adversely effects you cut it out of your diet.