Anyone who is sucking down Mt. Dews in quantity has tons of High Fructose Corn syrup which is high calories that your body can't even really recognize as energy or digest as energy so it puts it right into storage - i.e. Fat.
Secondly, all that caffeine is already a strong diuretic and IMHO it doesn't do a consistent excercize routine any good to be dehydrated cuz you are pissing out all your water.
Just cut the soda, eat sensible small balanced meals 6 times a day and make sure to get cardio and especially large muscle lifting (squats, etc) to increase your metabolism and keep it up.
