Probably dementia and Alzheimer's too, since you won't live long enough.

But if someone has ulcerative colitis it is almost always diagnosed in their before their 30's. There are many environmental correlates of this disease, such as living in a wealthy country and living far from the equator. The prevalence in Canada is more than 10 times the prevalence in Malaysia. Studies of different races living in the same country with the similar socioeconomic status have found much lower differences in prevalence (2-fold). It's correlated with excessive sanitation during childhood. It's probably strongly influenced by diet and hygiene norms.