These are my personal thoughts. I am not putting them here to dispute what others have to say. I disagree with some of the comments, but I accept that we all have our differing views.
I think that I would allow myself to die rather than to consume the remains of my companions - and if I knew that I was to die I would strive to make sure that my companions could not make use of my remains. However, I do think that I would eat things that I would normally find repulsive (e.g. slugs, snails, insects) in order to survive - and I would like to think that my knowledge of 'bushcraft' and my resourcefulness would mean that I would not have to turn to eating 'unmentionables'.
Death will come to all of us in its time and there are many, many people who have died far younger than me or who have lived far less satisfying lives. I do not feel that I have any more right than any of these men, women and children to give up what I believe is my essential humanity. To me it is a matter of Honour and when the time comes to face Death, I hope that I will face it with courage and grace and not 'do amything to survive'. That is not to say that I would not struggle to survive, but I believe that an honourable death is better than a dishonourable life.
And in the end, what does it actually matter to you? If you believe in an afterlife, then living for a few more years compared to an afterlife of eternity is nothing. If you do not believe in an afterlife, then once you die you will know nothing about it, so there will be nothing to regret.
Geoff