I've currently been working out for a few weeks now and can see a bit of an improvement with my physique which is a good thing, I don't eat anything before OR after my workouts but I heard having a Protein Shake/Bar before and then after workouts can help speed up the muscle building/repairing process, a friend told me to avoid these Protein Shakes and Bars as they make you feel really bloated and can cause you to add fat to the face and body. Is this true? Can someone please tell me the positives and negatives of using Protein Shakes/Bars?