When you tested food to see if it was agreeable, was it just for one meal, or did you do canned goods for several days in a row? The suggestion of eatting off your cache for a week is a good one. I've seen people eat stuff fine once or twice, but once they try living on them, not so good. The first generation of MREs come to mind. Particularly the omlette- after three days of those for breakfast.... It's better not to think about it.

Question- where are you getting canned beef? I can find hash and stew till I'm sick of it, but other than gourmet shops I can't seem to find real beef, just beef.