The 2% refers to the amount of fat in the milk. Whole milk is usually something like 3-4%. So 2% milk actually is the “other 98%.” Milkfat is actually not bad for you either, vitamin d is fat-soluble and taking the extra milkfat out can make it harder for you body to absorb it.

Fat is also flavor, and when it comes to something like yogurt you have to put something else in so it won’t taste like shit. That something is usually sugar. For the same flavor yogurt its usually at least double the amount in the fat free variety. And it still tastes like shit if you ask me.