One key to an entirely new kind of medicine is suggested by the placebo effect. But for this promise to come true, we need to see placebos as part of a holistic system.
You are either preventing or not preventing illness all the time. There is no such thing as benign neglect. The feedback loop is inescapable. Rather than considering that a threat, we can create a new model of well-being that gives you much more control over your health for life.
The key to the placebo effect is that the patient expects a good outcome, while in the nocebo effect the expectation is of a bad outcome: I will be pleased versus I will not be pleased.
In medicine, when we talk about the "nocebo effect," what we are referring to is the concept that adverse health or clinical events can be produced or influenced by negative expectations.
While some negative outcomes have nothing to do with patient expectations (adverse events are known risks with all treatments), the "nocebo effect" is especially pernicious because it can contaminate good care and is preventable.
My first foray into the nebulous world of antidepressants was in 1985 when I was put on Sinequan. It gave me severe cotton mouth, didn't do much for my mood.