I tried to drink 1/2 of an Atkin Vanilla ready made shake today. I emphasize the word TRY. I was not impressed. I was still hungry afterwards and a bit nauseous. I later made a devilled egg(teensy mayo.drop of mustard) and ate that, and felt 100 times better(and quite less hungry). Just my opinion from todays experience. The bars I like, but only eat 1/2 at a time, usually 1/2 before a gym session and 1/2 afterwards(a few carbs help, or maybe its the protein/fat? I'm not sure) I only eat these 2 or 3 times a week though.