Comment Don't Listen to Anyone Else on this Thread (Score 3, Insightful) 865
Most of them are going to give you advice you can't implement. I understand where you're coming from and I can actually help you as long as you don't mind the possibility of looking slightly foolish at work.
You work 12 hours a day. I know that you aren't continuously engaged in productive work. No one is. So start there. Every 3 hours take a 15 minute break and do the following:
Set a timer for 5 minutes then do:
100x Jumping Jacks
50x Pushups
50x Bodyweight Squats
50x Leg Raises
50x Crunches,
50x Russian twists (Russian twist is going halfway up in a crunch, then turning left to right, each direction is one)
When you first start out you will probably not finish this in 5 minutes. It doesn't matter. Stop at 5 minutes. Go get some water, walk around for 5 minutes and catch your breath.
Now go eat an apple and a handful of peanuts or sunflower seeds or some other healthy snack.
When you eat lunch eat a sandwhich, or a big salad, or a chicken breast, not a bigmac or a whole cheese pizza. Keep a GENERAL IDEA of how many calories you are eatting and keep it somewhere in the 1600-1700 range. You don't have to be precise here, just don't knock down the Triple Whopper and you should be ok.
Do NOT drink sodas. You drink WATER. Nothing else. Vitamin Water or Life Water is acceptable, Powerade and Gatorade are not.
Coffee is acceptable, but not recommended.
Eat every 3 hours, a smallish meal, approximately 6 times a day. Your target is an average of 300 calories per meal, but it's flexible.
And if you want to know what makes me qualified to give this advice and why you should listen to me:
http://www.youtube.com/results?search_query=kintanon&search_type=