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Story summary
- Researchers identify that lactase persistence is common in parts of Europe but rare in South Asia.
- Priya Moorjani of the University of California, Berkeley, finds Toda and Gujjar pastoralists have high lactase persistence.
- Natural selection favored the lactase gene in pastoralist populations, unlike other regions of South Asia.
- Fermented dairy products, containing less lactose, have historically been the safer choice for families.
