This is a normal thing, and I would experience thesame when I did not eat well enough. The reason you feel that, isbecause whey protein is a nutrient, and it gives you energy, justlike food would do. If it gives you such a boost in terms of energy,perhaps you should revise your diet plan, or your meals during theday. Obviously, eating before training will always give you moreenergy. In fact, it is the best pre-workout you can think of. Tryeating some tuna with rice before training instead of whey protein,and I promise you will experience the same thing.