That video is nice, but basically he’s describing the Atkins diet. Not such a bad thing in the short term but it has its own problems as we all know.
I believe that an excess of processed sugar is bad all around, but a small amount is not going to have a clinically significant impact on cancer one way or another.
My best friend’s son died at age 34 from glioblastoma. Oh, that’s a really bad
one! Most would say….He went completely sugar free - completely -as in fresh fruits, some veggies, ALL processed sugar, honey, etc.
His tumor kept coming back no matter the surgery (5), chemo or radiation (3). Finally they used CAR-T cell therapy and the cancer went ballistic - to the liver, lungs and spleen.
That video, while informative, is an oversimplification of cancer. No, it is NOT genetic, but please see my previous post about the 4 things necessary for oncogenesis. Genes play a part but not in causation; most probably in non-suppression or non-initiation. Does diet play a part - absolutely, as evidenced by the growing numbers of cancers among younger people.
Their diets are mostly horrible consisting of a lot of processed sugars, little fiber and tons of additives, which do God knows what.