In Reply to: The 30% is an average. Lactose tolerance in adulthood posted by is still very much different in different ethnic groups. sm on Wed, Jun 02 2021 at 07:48 AM CDT:
That's why I said I'm not part of the 30% of humans (i.e. the world population) who can tolerate dairy.
Considering my ancestors are also German, Scottish, Irish, & Dutch, I'd say it doesn't matter where your ancestors are from in the grand scheme of lactose intolerance. :o)
This Lancet article has a very colorful world map that's easier for my old eyes.