In 1924 a scientist named Otto Warburg happened upon a counterintuitive finding. Cancer cells, even in the presence of sufficient oxygen, underwent a type of metabolism cells reserved for rapid energy demand – anaerobic metabolism. In fact, even when cancer cells were given additional oxygen, they still almost uniformly defaulted into using only glucose to make ATP via the anaerobic pathway. This is counterintuitive because this way of making ATP is typically a last resort for cells, not a default, due to the very poor yield of ATP.~ Peter Attia, from https://peterattiamd.com/way-exploit-metabolic-quirk-cancer/
This is a simple introduction to the two methods our cells can use to get the energy they need to do everything; One way is efficient and one is not. It’s critical that our cells can switch between the two methods as circumstances change. The curious discovery made by Warburg is that cancer cells always use the inefficient method.