(1) Some individuals may lose the ability to digest lactose and become lactose intolerant.(2) The common sugars that form part of the diet are sucrose, lactose (milk sugar), and maltose.(3) Some babies are unable to digest the sugar lactose , which is in cow's milk formulas.(4) Soymilk does not contain lactose (milk sugar) and can be drunk by those who are allergic to normal milk.(5) The enzyme lactase breaks down the lactose to galactose and glucose.
📺 Word Example from TV Shows

Leonard's LACTOSE intolerant.
He can't eat anything here...
The Big Bang Theory Season 4, Episode 4

And until recently, I had no idea
that despite his LACTOSE intolerance...
The Big Bang Theory Season 1, Episode 17

that he's not really
LACTOSE intolerant, hmm?
The Big Bang Theory Season 11, Episode 17

...why can't they do something
about LACTOSE intolerance?
The Big Bang Theory Season 2, Episode 9

Uh, genetic weaknesses, right.
Um, there's the LACTOSE intolerance.
The Big Bang Theory Season 2, Episode 2