A shake can be a valuable option if you are unable to get a balanced meal of whole, real foods - I'll sometimes grab a SlimFast shake on my way out the door. But there is no additive, in any shake, pill, or drink, that is going to make you lose weight.
You don't want to replace all of your meals with shakes - 1-2 is the maximum recommended, and I'd consider 2 to be on the high side.
That being said, the GNC shake, to me, seems way high on carbs and lower than I'd personally prefer on protein. If I'm going to be satisfied, and therefore not eat more calories than I ought to, I need to aim for at least 10 grams of protein in a meal (more if I can!). Protein shakes like Designer Whey provide way more protein for the calories...9 grams of protein for 180 calories of shake just doesn't seem very protein-packed to me.
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