Tux said:Skim milk has NO fat. The only bad thing with milk is that it contains 12g of lactose, a simple sugar, per cup. For every 8g of protein you get 12g of simple sugar. Also, a lot of people are lactose intolerant. Never bothered me though, when bulking I drink a half gallon of skim a day or more, when cutting I use the fat-free carb countdown milk. 12g of protein per cup, and only 3g of lactose!
What Tux said. Depends how well you can tolerate dairy, but there is way too much simple sugar to make it your main source of protien. You can always change that ratio by adding a low carb protien powder if you are not lactose intolerant. That way you can chug your protien, but you still gotta eat real food.