I don't know if you can't read or what... if you're stuck on the island with nothing but sand on the island and the help arrives in 15 days and you can't live that long without food so will try to retrain yourself from eating the meat but you will eventually break and give in to the need to survive. Now, when I see that people are saying that they'd rather die from starvation than eat one fcking human leg, I hope that you end up in that situation, just to prove you wrong.
100% of the people who survived the Andes airplane crash employed survival cannibalism when it became the only way to survive. These were middle and upper-middle class people who were generally practicing Christians. I've not studied it in detail, but as far as I can tell they moved ahead with a normal life after the trying event.
Even on a 'island', I would certainly try every kind of potentially edible thing I could find before resorting to cannibalism and would probably spend a lot of time swimming around in the water in search of something which could serve as food. Probably mostly in very remote polar conditions where nature provides a freezer or on a boat or debris in the ocean would no possible other options exist.
In other words, from a 1st-world perspective it would be super rare for a situation to necessitate cannibalism...unless forced to by satanist weirdos like those who almost got the presidency of the U.S. Under Socialist mis-management, general corruption, and poor planning (if not design) can create such conditions. Just ask a Chinese or North Korean. No reports from Venezuela yet except a prison related corner-case.
I would predict that thwarting the will of the peeps with respect to the 2016 election has the potential to precipitate conditions of survival cannibalism in densely populated and inescapable urban areas like San Francisco.