Diet excuse to get me out of college meal plan?!?!?

I am going to a university and they are forcing me to get a meal plan. Only it is WAYYYY over priced, averaging to over $9 a meal. So i want to get out of having to get it, but the only excuse they will even consider is if i have the permission of the campus dietitian. I have an appointment with her next week. So in the mean time I need to come up with some kind of dietary excuse as to why I cant eat the food on campus and still be able to fake/ make it look believable that I actually have a dietary problem. Any help would be great!!!