Lactose is a sugar, as the same suggest. The issue is that humans can not digest it, but gut bacteria can. Babies and about 30% of adults do however produce an enzyme called lactase which breaks the lactose into sugars which can be digested by humans, galactose and glucose. Lactose free milk have lactase added to it so that this happen in the milk before you drink it. However glucose tastes much sweeter then lactose.
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