system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does lactose-free milk taste sweeter than regular milk even though they don't add sugar to it?
gpt
Milk has a special type of sugar in it, called Lactose.

This is the thing that gives regular milk its vaguely sweet taste, and also is what these lactose-intolerant people get 'sick' from.

Most milk companies add "Lactase" to regular milk. Lactase is a special enzyme that breaks down Lactose into two different types of sugars known as glucose and galactose.

The resulting new sugars actually taste sweeter than regular lactose does, hence the flavor difference.

PS. For lots of people, their guts make the lactase already, meaning they have no problems eating dairy products.