Jobs was a fruitarian in the 80s or earlier, back when he named his company "Apple". AFAIK he was neither fasting or being a fruitarian to fight his cancer, but overall he was a finicky eater all his life, a (sometimes lax) vegetarian with bouts that resembled a true eating disorder.

I don't have a source, but I recall reading that friends of his desperately tried to convince him to undergo "real" treatment for his cancer instead of relying on alternative medicine, so apparently he did try other options early on.

Here's a good compilation of his unorthodox eating habits:

https://www.psychologytoday.com/us/blog/naughty-nutrition/20...

"Hm, this guy died and one highly likely reason was his diet. In order to play him correctly, I'm gonna try that diet too."

Ashton Kutcher is not diagnosed with pancreatic cancer.