. "One serving and I stay full for hours......You taught me something!Bury this reply0Jeffrey F answered: Great answeres here already on protein shakes being OK to use, particularly for the 30/30 rule.A quick few tips:+ unflavored protein powder is preferred as it ensures there is no sugar, stevia, agave and other sweeteners that can delay progress+ all proteins sources are not equal." . . . <4hourpeople.com> .