Most people who have digestive symptoms when they consume dairy are lactose intolerant, so opting for lactose-free dairy products often fixes the problem. However, some people may not tolerate lactose-free milk either. In general, lactose intolerance usually causes diarrhea rather than constipation. In addition, symptoms usually occur at least 15 minutes after consuming dairy, once the lactose has reached the intestines. However, some people report having severe abdominal cramps immediately following milk consumption or report having constipation rather than diarrhea. In these cases, it may be worthwhile to test A2 milk to see if it causes less symptoms than regular milk.
Compared to conventional milk, A2 milk has the same taste and nutritional value in terms of calories and nutrients (carbohydrates, proteins, fats, calcium, lactose, etc.). The cows that produce it are not healthier, they just have a different genetic makeup. Thus, there does not seem to be any additional benefits in consuming this type of milk for people who tolerate conventional milk or lactose-free milk.
A New Zealand company (The a2 Milk Company) has marketed their milk in several countries, including in the United States. In the United States, it is sold in most grocery stores. In Canada, a farmer in British Columbia has recently launched his A2 milk marketed as D Dutchmen Dairy. In Quebec, the Missiska farm in Montérégie is the first to put on the market A2 milk (called Jersey milk) and its by-products (yogurt and cheese). These are sold directly from the farm as well as in several commercial outlets in the Montreal and Quebec City areas.
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