This study suggests that tolerance is around 18% in South Asia, and that it originated in the Middle-east, not Europe: https://sciencelife.uchospitals.edu/2011

This study suggests that tolerance is around 18% in South Asia, and that it originated in the Middle-east, not Europe: https://sciencelife.uchospitals.edu/2011/09/14/lactose-tolerance-in-the-indian-dairyland/ https://sciencelife.uchospitals.edu/2011/09/14/lactose-toler...