I saw a documentary about a guy with a very specific cancer. He was a medico, and basically on a life sentence, so he did his research. And he is in remission, but only while he does his keto diet. It is not for the casual dieter. He has all the time available to him, and it takes a lot.

Things like eating insect protein, just sourcing it is difficult. Not appetising, but if the alternative is death....................