Non-diabetic children may have such antibodies, but only at much lower levels. Evidence suggests that the combination of a genetic predisposition and cow's milk exposure is the major cause of the childhood form of diabetes, although there is no way of determining which children are genetically predisposed. Antibodies can apparently form in response to even small quantities of milk products, including infant formulas. Pancreatic cell destruction occurs gradually, especially after infections, which cause the cellular proteins to be exposed to the damage of antibodies. Diabetes becomes evident when 80 to 90 percent of the insulin-producing beta cells are destroyed.
Milk proteins are also among the most common causes of food allergies.
Often, the cause of the symptoms is not recognized for substantial periods of time. Many people, particularly those of Asian and African ancestry, are unable to digest the milk sugar, lactose. The result is diarrhea and gas. Galactose has been implicated in ovarian cancer 8 and cataracts. Nursing children have active enzymes that break down galactose.