Hayden Murphy is among more than 400 children and adults participating in U.S. government-funded international research investigating whether experimental insulin capsules can prevent or at least delay Type 1 diabetes. Children who took insulin pills showed immune system changes that the researchers said might help prevent diabetes. Type 2 disease is more common, affecting nearly 30 million nationwide and most of the more than 300 million worldwide with diabetes. Besides short-term complications from poorly controlled blood sugar, both types raise long-term risks for damage to the kidneys, heart and eyes. Viruses and other infections are among factors suggested as possible triggers the disease, which causes the body's immune system to attack insulin-producing cells. Dr.