[melq]

If its healthy during infancy why would it be unhealthy during adulthood?

[uhtred]

Because the average adult doesn't need such a high concentration of fat and calories in a single drink / bowl of cereal / piece of cheese etc. If it was healthy and natural you'd be drinking your mother's milk as an adult, but I'm sure you aren't.

[melq]

>Because the average adult doesn’t need ...

This doesn’t mean consuming a moderate amount of milk is somehow unhealthy.

[bluGill]

Because for species other than humans the ability to digest milk is lost when they become an adult. This genetic adaptation changing everything.