Answer:
Colitis is an autoimmune disease, so your body is attacking you. Autoimmune diseases are hereditary, and are passed down through family. 20% of people with UC have a family member who also has UC. There is no way to prevent colitis, but it occurs more frequently in industrialized countries, that have foods high in fat, and more often occurs in colder climates. People of European and Jewish decent are more common to get colitis. I would recommend that you do more research on UC.