I actually read a book called placebo by Steven James which is a great book by the way. I highly recommend it and it's kind of a mystery book. Anyway in the book it obviously integrates the placebo effect into the story. What I read was astounding. Placebos have been known to treat diabetes, cancer, pneumonia, and many other diseases. It's crazy. Almost like the mind is healing the body on it's own. This however only works 30% of the time so probably not all the time but it's pretty crazy to think about.