When my in-laws moved from India to the United States some 35 years ago, they couldn’t believe the low cost and abundance of our milk—until they developed digestive problems. They’ll now tell you the same thing I’ve heard a lot of immigrants say: American milk will make you sick.
It turns out that they could be onto something. An emerging body of research suggests that many of the 1 in 4 Americans who exhibit symptoms of lactose intolerance could instead be unable to digest A1, a protein most often found in milk from the high-producing Holstein cows favored by American and some European industrial dairies. The A1 protein is much less prevalent in milk from Jersey, Guernsey, and most Asian and African cow breeds, where, instead, the A2 protein predominates.
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Author Credits: Josh Harkinson
Image Credits: Pexels