in an article on the mind/body effect (what we think, and how it effects how we feel) on cardiac patient, after under going a proceedure that required anethestia, heard his cardiologist--while he was 'still under' talk about galloping heart (an unhealthy rythm that is frequently progressive and fatal)

but this man made an incredible recovery.. and told his cardiologist, "i knew before the procedure, my chances were slim, but when i heard you tell the other doctor, i had a galloping heart, i figured i had to be as strong and as healthy as horse, that the procedure worked. and i knew i would get better, feel better, in no time. I can't thank you enough doc."

the cardiologist reminds himself all the time, when a patient has a good attitude, he (she) is likelier to have a good outcome. --what we think about our health(even if it is wrong) is often what we get.