Oh it's great....$4 bottle water/soda. $3 apple. $15-20 plate of shitty food. Then of course a single thread T-shirt made in china (for $.03), $50.
Yeah, that's always been my only complaint about theme parks, is the lousy food.
But I have gone to disneyland while dieting, twice. I just have all my meals packed in those ziplock tupperware containers and have them stacked in a backpack. Security goes through your bag, but they don't care if you have food. I even went in with a gallon of ICED TEA crystal light, which I started to worry that they wouldn't allow, cause it did look like alcohol. And the guy asked what it was, I just told him crystal light and he was like, okay that's fine.
But you still have to get a couple of Churros, that's a given