Put your helmets on.
In '88 I deployed to Bakhtaran, Iran on UNIIMOG. We lived on hard rats (IMPs were still relatively new then, didn't have the variety we have now) for four months. Our cooks did a damned fine job of providing salads and stuff like that from local sources, but we ate IMP's morning, noon, and night. Anybody remember Macaroni and Cheese with Peas - for Breakfast!!! Or "Lung in a Bag" omelettes? I was lucky - I really did like the ham omelettes, so I could trade whatever I had for those. I also remember a period of three or four days when I was pissed off about something, can't remember what, and for some reason I got it in my head that I'd only eat Cherry Cake (which was contained in the IMPs at the time). Everbody in camp was giving me their cherry cake - to this day the sight of cherry cake (even the REAL stuff in bakeries) makes me turn green.
Fast forward 14 years. I deployed to Kandahar with 3 PPCLI BG - we ate IMPs and American MRE's. Granted, there was a kitchen, where we were served very similar stuff (T Rats - same stuff, in bigger "group" packages heated up and served by cooks), and some fresh food was available. Once again, our cooks did their damndest, and by the end of the tour we had had a few Canadian barbecues and breakfasts. Well done to Graham Key, Soupy Campbell and crew - even three years later my hat's off to them.
Bottom line - nobody starved to death, nobody sufferred (to my knowledge) any lasting gastro-intestinal problems, we were OK.
Gotta say, though, that the variety and quality of IMPs certainly has improved over the years (remember the glass in the Cheese Whiz??)