Annie, I was reading something this weekend that made me think of this post. Whey protein is a fast empyting protein - it gets out of your stomach quickly and to your muscles. It also contains Glycomacropeptides (GMPs). These are BCAA that trigger the release of CCK, a powerful hormone that suppresses appetite. I've found that my new protein powder makes me feel incredibly full right after and for about 2 1/2 hours later, and I make it with nothing but water.

Nat