Imho, a much more powerful force is the loss of innocence. You know X is bad for you because you experienced it before; so you don’t do X. And Y. And K. And slowly, you don’t do very much at all, except very safe boring stuff. You would really like to go back being a fearless child, but you can’t: even if your body could heal like it did before, your mind won’t forget all the stuff you went through.