Dr. Thomas Seyfreid talks about weakening cancer cells by fasting and a low carb high fat diet. It’s an hour long interview:
https://www.youtube.com/watch?v=eoDDZnfYonw&t=0m1s
I can certainly believe this. In terms of fitness and bodyfat a low carb low sugar diet is definitely the way to go. Been there, done that, got the 6 pack to show for it.