There are more than 100 known autoimmune disorders, including rheumatoid arthritis, type 1 diabetes and lupus. Normally, your immune system is designed to protect your health. But in some people, the immune system creates autoantibodies that attack the cells and tissue they're meant to protect.According to a study, more than 32 million people in the USA have autoantibodies. Not all who test positive for them develop autoimmune diseases; experts believe genes and environmental factors may play a role. Here's a look at some recent findings:Exercise can help ease rheumatoid arthritis. A new report shows that more than 40 percent of …