cmeine

That's probably why. You need to get your system used to healthy alternatives to what you were eating. It's going to take some time but stick with it. This is so much better for you than what you were doing to your body. Add some good protein (greek yogurt), PB2 and some good carbs (berries) to the shake and it will help.…

Are you drinking enough water? That does make a difference. Also you still should be having something that is high in fiber & healthy a couple hours after the shake for a mid morning snack.