re: #200 b_sharp

Welll…

Some of us have evolved a tolerance for milk into our adulthood.

Yes— because that provides an actual benefit.

There are definitely differences in metabolism of alcohol among humans— and metabolism of opioids, which are heroin. There are no drugs that exist that can affect us that don’t hook into things that have evolved.

There is no purpose to alcohol tolerance, evolutionarily. There is no benefit that it actually has. It is likely that the enzyme that helps bind ethanol evolved for some other purpose— probably dealing with intracellular ethanol.

We have enzymes that deal with opioids. We have enzymes that deal with ethanol.