I didn't go through formal recruitment but the COB I went through had a TON of food. I'm talking ice cream, pizza, the whole nine yards. And I am a diabetic.
Since my insulin schedules at the time had me eat beforehand, I simply declined any and all major meals they served. Granted I had a couple snacks, but it didn't count against me if I didn't eat the whole meal.
However when I started searching for non-existant diet soda the first night, people started to take notice and asked why. On future nights, there was a two liter bottle of diet soda there, as well as water.
If anything, they will accomodate you rather than turn there noses up at you.
ETA: Phoenix, I'm not on the pump unfortunately. Although I broke my sisters in real quick on Bid Day the year I rushed when I whipped out my shots and vials. I also have no shame.
