Westman is no fringe doctor. He is mainstream and does not recommend things unless there is science and trials with data to back up what he does.

I have heard this from numerous doctors in the low carb community and there appears to be some science to back it up. Not a cure for cancer but an improvement in the tolerance of conventional therapy. Could be important to someone facing cancer treatment.

https://www.youtube.com/watch?v=txC1CkT8Mlw