Sometimes my fridge contains too many varieties of milk — whole milk for my toddler, 2% low-fat milk for the other kids who hang out here, and skim milk for my husband. Seeing the lineup got me thinking recently: How exactly do you get all the fat out of skim milk, and is that the only difference between it and the other kinds of milk? Skim milk goes by “skimmed milk” in the United Kingdom and Canada. It is also sometimes referred to as nonfat or fat-free milk.