A new study led by Western biological anthropology professor Jay Stock, suggests that milk consumption in some regions between 7,000 and 2,000 years ago led to an increase in human body mass and stature. This ran counter to trends in body size experienced elsewhere in the world. This size increase is found in regions where there was evolution for higher frequencies of genes that allow humans to produce enzymes to digest milk into adulthood—called lactase persistence.
source https://www.lifetechnology.com/blogs/life-technology-science-news/milk-consumption-increased-ancient-human-body-size-finds-study