My roommate bought this K2O protein water. It has 30 calories, 0g fat, 7g carbs (5g fiber, 0g sugar), and 5g protein. What do you think. The protein is just whey protein, but it does have a decent amount of fiber in it. The fiber source i believe is polydextrose, because i cant find anything else that could possibly be considered fiber on the ingredients list. What do you think?