My understanding is that cancer cells short circuit the krebs cycle [1] and survive off fermented fuels like glucose and most of the amino acids, l-glutamine being the most prevalent and available. Most of the population have an over-abundance of glucose.<p>[1] - <a href="https://www.youtube.com/watch?v=06e-PwhmSq8">https://www.youtube.com/watch?v=06e-PwhmSq8</a> [video][unpopular opinion]