I'm down with the diet issues comments. I was a diet nazi for some years, eventually I progressed and I decided that in fact it was not OK that I had not had any birthday cake etc. for those years. I did feel pretty well never eating a food I was sensitive too-I had a test for food allergies at the naturopath's office--but it was true that there was almost nothing to eat.
One of the few things an MSer can do normally is eat--as in go to a restaurant and have a meal with friends. I sure can't golf or spend a day sailing with them, but I can be there for the meal and coversation part. If you are a food nazi this gets very difficult.
And if you are trying to do swank and BBD...and food sensistivities to boot, forget it! You are left eating quinoia, rice, bananas, apples and kale.
When I got my food sensitivities done I was sensitive to every food I eat regularly. Lettuce for crying out loud--LETTUCE! can you imagine a diet without that?
It'd be worth it if it stopped MS but it did not seem to. I try to rotate now and avoid a lot of any one thing. And if I get invited out, I go and I eat whatever looks good. It is a quality of life issue.