As a continuation of a question of most adults being lactose intolerant, the marketing of The a2 Milk Company in Australia House at SxSW 2018 suggested it may not be lactose-intolerance, after all, but instead the sensitivity to the A1 protein found in cow's milk prevalent within certain countries that's causing the milk-drinking discomfort issues.

Looking for milk for Lactose Intolerance? Did you know that some people who experience lactose intolerance symptoms might actually be sensitive to A1 protein?


Many people, even trained healthcare professionals, assume if they have discomfort after drinking milk that they’re lactose intolerant without being tested to make sure. But research suggests that only about 5-7% of these cases can be attributed to Lactose Intolerance!

Is this really true?! Only 5-7% of lactose intolerance diagnoses are correct?! This would appear to be a very disruptive phenomenon on misclassification of the vast majority of the population, yet Wikipedia articles on Lactose intolerance and A2 milk, for example, make no mention of any of this, and instead the latter article goes into lengths of how The a2 Milk Company has unsuccessfully tried to lobby various governments for warning labels for non-A2-milk around unrelated and unproven long-term health effects of A1 vs. A2 milk.

Moreover, as a followup question, if it's really true that we're all not lactose-intolerant, after all, then where's the rationale for the lactase enzyme supplements and LACTAID® milk seemingly addressing the associated discomfort issues of the generic milk?!

  • See other questions on A1/A2 such as skeptics.stackexchange.com/questions/30847/… – GEdgar Jul 17 '18 at 0:16
  • @GEdgar, those other questions are about long-term health effects without a clear relationship to immediate discomfort and flatology. – cnst Jul 17 '18 at 0:30
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    "Is this really true?! Only 5-7% of lactose intolerance diagnoses are correct?!" You misrepresented/misinterpreted the statement. It's only a small percentage of people who self-diagnose as lactose intolerant that really are. It says nothing about people diagnosed as such by medical professionals using standardised allergy testing. Furthermore, given that the article is published on a website trying to sell you a product, I'd be rather skeptical about its findings. – jwenting Jul 17 '18 at 5:13
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    @jwenting, your "some" would make sense if it wasn't for 75% of population being lactose-intolerant as per prior studies in my prior question, and surely the diagnosis is by the medical professionals performing the studies. When put together, these claims on A2 are really hard to put together with the prior knowledge. – cnst Jul 18 '18 at 0:16
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    @jwenting That's incorrect. Even among Caucasians, adult lactose intolerance is extremely widespread. It just doesn't manifest as an absolute intolerance but rather as a (severely) reduced lactase activity. The symptoms are the same though, just off varying severity. – Konrad Rudolph Jul 19 '18 at 7:36

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