A2 Milk and Dairy Intolerance

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A2 Milk and Dairy Intolerance

Many people believe they are lactose intolerant, but it may be a protein intolerance to the beta-casein protein A1 instead of a decrease in lactase enzymes. Research is showing some associations between A1 beta-casein and gastrointestinal distress. Another form of the protein, A2, does not cause these symptoms. Beta casein is the second most common protein found in cow’s milk and the difference between A1 and A2 beta casein is one amino acid: histidine on A1 and proline in the same location on A2. This amino acid variance changes how the protein is cleaved, and therefore the byproduct of the protein, beta casomorphin-7 (BCM-7). Studies have found higher inflammation markers, softer stools, and increased bloating and abdominal pain from consumers of A1 milk than in those drinking A2 milk. These studies were connected to the dairy industry, and are being used to promote A2 containing milk products.

The A1 protein is also being studied for its impact on other disease processes such as heart disease, diabetes, schizophrenia, autism, and SIDS, but studies are conflicting.  Studies found some association of A1 milk with heart disease, type 1 diabetes, and cholesterol levels but the research has numerous flaws and is questionable.


Addressing public concern is important right now because there is not abundant, clear information on the implications of A1 milk, and news and research is often interpreted incorrectly by the public, causing fears to circulate and people to stop buying milk. The a2 milk company has had success marketing A2 milk in other countries and has started selling milk in the U.S.. Clients may ask questions regarding intolerance to dairy and it is important to explain to them how products differ, and how they are the same. Clients can be encouraged to try different products to see which they tolerate best as long as they don’t have an allergy.

-AC

Thalheimer, J. C. (2017). Is A2 milk the game changer for dairy intolerance? Today's Dietitian, 19(10). Retrieved from: http://www.todaysdietitian.com/digitaleditions.shtml.  

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