@Mor - I've had a friend with Crohn's disease and I have to say I wouldn't wish it or the symptoms of it on anyone. I've got a history of intestinal problems in my family and I'm a bit paranoid about trying to eat right so that I don't end up with any problems there myself.
The worst thing about these kinds of colon diseases are how much they limit you. My friend says he's always got to think about what he's eating and where he is in case he needs the toilet. It can also cause awful rashes and abscesses and things. It's definitely not a fun disease.