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3. The Milkshake Gene
Why have some humans evolved the lifelong ability to eat dairy foods, when no other mammals have? With Dr Kat Arney. From 2020.
Dr Kat Arney finds out what we are made of one gene at a time.
Are you dairy intolerant? If so, you’re not alone – more than two-thirds of adults in the world are unable to digest delicious milkshakes and other dairy products properly.
10,000 years ago all humans were like that. So why on earth did some of us evolve the ability to tuck into cheese, butter and cream with a vengeance?
And why are farming - and farting - vital parts of the story?
Dr Kat Arney finds out, with the help of:
Evolution expert Professor Mark Thomas of UCL.
Producer: Beth Sagar-Fenton
First broadcast on BBC Radio 4 in April 2020.
On radio
Wednesday09:30
BBC Radio 4 Extra

