I apologize, I'm new and not very attentive. I do remember the logic however was unable to find the source. Your body heals approximately 10x slower than your tongue. The claim is that without naturally evolving to the state that both healed equally as fast as you've outlined. It's if by some miracle your body started to heal at the same rate, your body in it's current state would not be able to convert food to energy fast enough to maintain the level and speed of healing. And your caloric intake would need to (I can only assume) 10x what it currently is, and that's a lot of food. I'm sorry to hear of your ED, I trust you recognize I'm not attempting to be pedantic or triggering, I intended this to be as the title stated, a fun fact that people don't believe is true.