We need to clear something up — there is no such thing as high calorie and low calorie protein. This is something that was made up to sell people poor quality products. The impression that you get from the name is that the only difference between the two products is the calories but people don’t realize that if the calories per serving goes up, then the amount of protein per serving must go down. This causes these two products to be completely different. The main ingredient in so-called high calorie protein isn’t protein at all — it’s sugar. A more honest name would be “high protein sugar” since that’s what you’re buying. A steak and a doughnut are not the same thing.
So don’t be fooled by this. In English, we call these products “weight gainers” since that’s what they do and in my opinion, that’s more honest.