Eat to beat diseases: The Body's Five Defence Systems And The Foods That Could Save Your Life by Dr William Li. You can read the synopsis on Amazon.
His thinking is that we get diseases/ill from damaged DNA (either from medical treatments X-Ray, radiation, scans etc., or, damaged inherited DNA from one or both parents).
I believe he has carried out placebo testing to back up his scientific research.
Think I will buy as damaged DNA is a new science to me but kind of makes sense.