"STOP ANY AND ALL SUGAR INTAKE IMMEDIATELY. IT IS ONE OF THE ENERGY SOURCES THE CANCER CELL S LOVE"

I find this confusing. "Sugar" is a generic term. For example, there is glucose. Sometimes called "blood sugar", it is the main (only?) fuel for our brains. And our muscles use it a lot. Then there's fructose, found in many fruits and vegetables. It can be good ("an apple a day...") or bad (high-fructose corn syrup), or do we mean sucrose, table sugar, from things like cane and beets? There may be other sugar variants. Some of them are essential to survival.

What "sugar" should we specifically eliminate?