So our brains produce substances that can improve your health, stuff like endorphins, gamma globulins. These chemicals strengthen your immune system

Recent research has shown that what your brain produces depends, at least in part, on your thoughts, feelings and expectations

And in their study, Drs Heather Rasmussen, Michael Scheier, and Joel Greenhouse, showed that when you’re sick and you have hope, a positive attitude, AND believe that you’ll get better, your brain produces the appropriate chemical response.