I don't think we can honstly make a pronouncement on that one - it is up to every man's and woman's conscience. Personally I follow the Kal va chomer rule when all other options seem exhausted. Having had uncles who (barely) survived internment in Japanese POW camps in WW2 who told me of what they were forced to eat (rats, mice, beetles, etc.), I am a little liberal in this area. Kashrut, I assume, was made for man, not man for Kashrut. So in a life-and-death situation, I will feed my family what I have to. Neverthless I will do what I have to as long as I can to ensure I live kashrut.

As a footnote I want to say that we as a family are already cutting down the AMOUNT of food we're eating. We actually eat FAR too much and it's not healthy and that's part of the reason the West is so obese. The learned in the Orient that one should never eat more than two-thirds stomach capacity and that many small meals is better than fewer large ones. In the Ukraine I had to get accustomed to the fact that the people there only ate TWO meals a day - breakfast and supper. We certainly have a lot of bad habits to change and the sooner we change them, the easier it will be to survive.