...First create a realistic situation in which humans are LITERALLY the only thing left to eat, and then I'll give my answer.
Not to mention, none of the people who said no realize that they would be in a whole different mentality at this point so using your current mentality to answer the question is wrong.
These.
Ever hear of the
Donner Party? Probably the most God-fearing, Bible-thumping people you could ever (not) hope to meet. Keep in mind these were people who had never heard of TV or the Internet, so they were never exposed to rated-R movies, pr0nz, 4chan, or any other forms of human depravity (aside from the occasional crimes that were committed in their time).
As strong in faith and untainted in mind as they were, when faced with death, they ate not just any human being, but their own friends and family members.
No one can say that they would never eat a human.
I'm vehemently opposed to the idea of eating a human. As I am now (e.g., not starving and on the brink of death), the thought of cannibalism disgusts me to no end. But there's no telling what I would do to survive. And having spent a year dissecting human bodies, I'm quite comfortable around the dead.
Of course, if faced with the situation I would exhaust all other possibilities (eating inedible plants, insects, etc.) before ever considering cannibalism.
*EDIT*
If I were with my fiancee or, say, I had a child, and they died before me, I can say with almost 100% certainty that I wouldn't eat them. I would sooner kill myself and let them eat me so that they could survive. If anything, I would lie down next to their bodies and die quietly alongside them.