It didn't "change". They're just two different names for the same thing.
Low fat (semi skim) and Fat Free (skim) milk
SKIM milk is fat free milk.
Skim milk has a small amount of fat while fat free has no fat in it
Conventional method of making skim milk involved removing a thick layer of fat from whole milk. However, these days a process called as centrifugation is used to separate the fat content from the milk. The milk that is obtained after removing all of its fat is called as skim milk.
usually skim milk is consumed by people who are conscious about their weight. skim milk is also labeled as "NON FAT MILK", for it contains about 0%-0.3% of fat compare to a "WHOLE MILK" which contains 3% to 4% fat.
Skim milk or reduced fat milk, Low fat or fat free yogurts.
Skim Milk is better because whole milk has the fat in it. Skim Milk has no fat because they took it out.
Skim milk lacks milk fat.
Skim Milk contains less fat, they skim off the butter fat, which mack whole milk fattier.
Soy milk is made from beans and skim is from cows. Skim is also fat free.
Skimmed milk has a bit of fat, fat free milk has no fat
Skim milk because it has no fat in it. It also isn't as creamy, which contributes to the added fat in whole or fat milk.