Sure dude:
adult lactase persistence in ancient skeletons in Northern Europe, Scandinavia, southern France and elsewhere.
https://www.npr.org/sections/thesalt/2012/12/27/168144785/an...
adult lactase persistence in ancient skeletons in Northern Europe, Scandinavia, southern France and elsewhere.
https://www.npr.org/sections/thesalt/2012/12/27/168144785/an...
Lactose intolerance is an issue involving lack of endogenous proteins, not the gut biome.
Asians, all humans, except for rare cases can digest lactose in infancy.
IBS is a functional gut pain/dysfunction syndrome. Those with lactose intolerance don't get IBS when they eat cheese.
There is still a percentage of non-European population that can consume lactose into adulthood, and not break it down without any external symptoms.
Lactose tolerance is estimated at 30-45 percent.. So it's a substantial non-European population. The intolerance is heavily skewed toward East and South Asia -- though a lot of South Asians consume milk and paneer.