Look at a website called orthomolecular oncology ,it gives nutritional advice and the rationales behind it.There was a man called Michael Gearin-Tosh (not sure about the spelling) who chose diet over standard treatment and survived on a difficult regime .. too much for most of us for 10 years after being diagnosed with full blown disease.He succumbed in the end to an infection because he was stroppy about antibiotics. He wrote a book as well The site does not advocate avoiding normal treatments but many of their bits of advice make sense.Read the sites advice,read the book and see what can be included in a good healthy diet in an ordinary way.The site also talks about adjuvent treeatments (as well as) treatments,meditation etc.