I believe much in this world is down to the placebo effect..
Placebo is Latin for ‘I will please’ and refers to any medical treatment that is inert (has no active properties). A placebo doesn’t have to be a pill. The placebo effect is the positive effect on a person’s health experienced after taking a placebo. It is triggered by the person’s belief in the benefit from the treatment and their expectation of feeling better, rather than the characteristics of the placebo.