types of autoimmune diseases, and the numbers are rising. Take Crohn’s disease, the increasingly common inflammatory bowel disease. Before 1932, when Burrill Crohn, a New York physician, described it in a paper in The Journal of the American Medical Association, it wasn’t even a recognized condition. At that time, Crohn’s affected one person in 50,000. Then it became one in 10,000, then one in 5,000. Today the proportion is one in 250 and still rising.*2 Why this has happened
