John F. Eldredge wrote:

Cats can digest milk as kittens; the problem is that many (perhaps all)
of them eventually stop producing the enzyme needed to digest lactose.

And that makes sense to me. If the ability to digest milk is no longer
necessary (because the baby has grown up and is hunting and/or foraging
on its own), why devote the body's resources to that, when they could be
put to better use for more important survival purposes?

Joyce

--
audiophile, n:
Someone who listens to the equipment instead of the music.