During my training and my marathon I drank half apple cider/half water mixed in my camelbak (so I now have to wear a Camelback, naturally). I made the peanut butter brownies from the SCD book and carried those as well as some slices of apple and cheddar cheese. I eat lots of fruit all the time and I find that oranges, apples and bananas make me feel even better on the run than gels and gatorade.
I haven't experienced any kind of immunosuppression with my training on Remicade. But I think I am lucky in that I never have the typical colds and infections some people get with Remicade. I really attribute this to eating right and getting enough sleep (and lots of hand washimng and avoiding sick people!).
Oh yeah..peanut butter is my best friend. Only the natural stuff with no sugar. I love to come home and slice up an apple and dip in it.
I actually feel like I'm a much better runner than before I was diagnosed. I think that is mainly because I know it's something that could easily be taken away from me so I better enjoy it now. I have two more marathons and a 50k coming up in the next two months!
the weight loss from the diet really helped my joints a lot. I don't have crohns probs with my joints but they do ache sometimes.