I have a Slim Fast drink in the morning, a normal meal at lunch and then a Slim Fast at dinner time along with a little snack, such as grapes or an apple and I feel pretty good...
In addition, I do 45 minutes on the treadmill 5-6 times a week at a pretty decent pace (I normally lose about 2-3 pounds of water weight)...
And I don't think its water weight, as I drink 3-4 glasses of water a day...