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Boyd Swinburn, MD, Chair in Population Health in the School of Exercise and Nutrition Sciences at Deakin University, in a report commissioned by the New Zealand Food Safety Authority, titled "Beta Casein A1 and A2 in Milk and Human Health," and completed July 13, 2004, concluded:
“About 25-30% of the protein in cows’ milk is beta casein… One of the forms is called A1 beta casein and it has been suggested that it might cause or aggravate one type 1 diabetes, heart disease, schizophrenia, and autism.
The strongest evidence is for type 1 diabetes and heart disease. The main study supporting a relationship with the type of milk consumed was a comparison of 20 countries. Those countries with the highest consumption of A1 beta casein had the highest rates of type 1 diabetes and heart disease.”
July 13, 2004