There is no known "cure all solution not entirely endorsed by the FDA that will solve all of your motivational and health problems in one fell swoop." A lot of people with Crohn's seem to get some benefit from changing their diet. But the conclusions they draw always seem to contradict each other and in general the improvements are temporary. What it looks like to me (and at least on person with her own experience of the problem) is that radically changing your diet every few years is what you need to do.