Cancer is constantly hungry and eats way more than normal cells. It requires way more energy because it’s growing rapidly. It tries not to pursue the more difficult metabolic pathways to get energy, preferring quick and sustainable, easy methods; in other words, it likes sugar and simple carbohydrates that quickly break down into sugar. Those provide the fastest and easiest means of energy production for any cell, cancerous or otherwise. But they also provide a no-oxygen path to that energy: muscles use this path during heavy exertion where oxygen can’t be provided fast enough, and it provides energy to the oxygen-deficient muscle cell and in the same way this no-oxygen energy can provide energy to a low oxygen (hypoxic) growing tumor. This provides a strategy against cancer: make it hard for it to get its energy.