To try and use the "certain foodstuffs must be maintained at a certain temperature" rule seems some what nanny-ish. I've had more food poisoning from airline food, both as crew and as passenger, than I've had from any other commerically produced food in my life.
Lots of foodstuffs are not temperature sensitive, and so long as you don't remove them from the aeroplane on landing, you are not trying to import them. Are they going to try and stop you take a mars bar or some maltesers onboard?
Our standard 'travel kit' out of MAN always conatins some chocolate and IrnBru. So far I've never got food poisoning off that..... and I always manage to force it down just before we land in the US, thankfully.....
Looking on the bright (sort of) side - if they insist you eat their food only, and you get food poisoning, you could go all American and sue them into next year
