Cow's milk may increase the risk of diabetes

"Does drinking infant formula made of cow's milk increase the risk of developing type 1 diabetes?

In 1993, a Finnish study found that consuming dairy products early on correlated with diabetes risk. One explanation is that beta-lactoglobulin, a protein in cow's, but not human, milk prompts babies to make antibodies that also attack glycodelin, a protein vital for training the immune system. The mistuned immune system then mistakenly destroys insulin-producing pancreatic cells, leading to type 1 diabetes.
"The mistuned immune system mistakenly destroys insulin-producing cells"

Now Marcia Goldfarb of the company Anatek-EP in Portland, Maine, has found that five children with type 1 diabetes, who were fed cow's-milk formula, all have antibodies to beta-lactoglobulin (Journal of Proteome Research, DOI: 10.1021/pr800041d).

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