not all protein shakes are fatty!! you said you had whey? thats the best protein powder. you need to analyze the rest of your diet.

No it is not because of the whey powder. In fact, it is extremely unlikely you have actually put on 4 lbs of fat in less than two weeks from any cause. You would have to eat like a pig every day.

That said, the protein powder will add to your caloric intake approximately 4 calories per gram so the 25 grams is adding 100 calories per day. When you add calories to an otherwise energy balanced diet, you will gain weight. In other words, the protein is all going to fat.

The only alternative is to eliminate 100 calories of some other food. Protein powder is what most people call "empty calories" so, in order to not gain weight, you will be eliminating some real and healthful food in order to eat empty calories.

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gotta run...

I too think that rather than point the finger at the protein supplement, you should look at your diet overall. You might find fitday.com helpful in taking a look at how many calories you're actually consuming and your dietary/nutritional breakdown. Like someone mentioned, a 1/2 serving of the Isopure equates to an additional 105-110 calories to your daily intake.

I too use Isopure to supplement my diet in the mornings and sometimes as a b/f bedtime liquid snack -- I actually find it helps me control my hunger better, it enables me to add more protein to my diet, and I'm more prone to "eat" breakfast rather than skip it like I normally did since my stomach doesn't handle things too well in the mornings.

Additionally, perhaps you need to recalibrate your scale? Another reason for the perceived weight gain might be fluid retention. My weight easily fluctuates 3 lbs during the day so I wouldn't worry too much. Weigh yourself again a week from now and if you're still 4 lbs heavier, then start reassessing your diet/exercise...

The Isopures are whey protein isolates and have 0 to 2 grams of carbs (no sugar) depending on the flavor you get. They also contain taurine (in their "amino acid blend") and L-glutamine per serving.