• MonkderVierte@lemmy.ml
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    9 hours ago

    Btw, is there a evolutionary cost to creating lactase? Because, why do we stop with it usually and only keep it if it has huge advantages?

    • Rob Bos@lemmy.ca
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      9 hours ago

      I would guess that humans have been around for what, 250k years? And that the vast majority of that didn’t involve a whole lot of milk after age 4.

      So it wouldn’t have been to much advantage to be able to metabolize lactose.