I don't know about this northern European thing. Not saying it's wrong, but the Masai drink a lot of cow's milk. Maybe the trick is they mix it with blood.
See my prior post.
Lactase is the enzyme which allows us to digest lactose.
Lactase persistance is the name of the genetic condition which allows the body to produce lactase through adulthood.
The gene for lactase persistance has appeared several times in human evolution. Several places have been identified at this time where this gene has appeared.
Two seperatate genes exist in African populations, each of which confer lactase persistance. This indicates that this ability evolved in two seperate places and times in Africa alone.
