06-02-2016, 10:32 PM
You'll have to choose some kind of macronutrient to get enough calories at some point. If you want to stay in ketosis, there's always plant fats like avocados, nuts & seeds, olives, and coconut to stay low carb. There's also people who claim fruit cured their cancer. Here's this video of durianrider's girlfriend interviewing a girl who cured her terminal brain cancer by going raw fruitarian. It's anecdotal evidence, so take with a grain of salt.
From studies I've seen, IGF-1 and Casein seem to be the biggest cancer promoters which are heavily found in dairy and meat. Studies do seem to show vegans have lowest rates of cancer. That might be the reason.
Check out this video where people with a certain type of dwarfism that can't metabolize IGF-1 essentially makes them immune to cancer!