Just try to eat this.
Anyone who has had Crohn’s disease or UC for very long will no doubt already have an idea of which foods they should avoid. Whether they have been advised by their medical care professional or have found out the hard way, they know what not to eat.
Don’t make them uncomfortable by asking them to just given into peer pressure and try a taste of something just because you like it. It may seem odd to you that your friend orders the same foods every time you go out to eat, but they just don’t want to get sick or be in pain.