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The idea that our emotions have a crucial role to play in our physical health, has been known for eons of time.

As such, we have seen the emergence of ideas from Andrew Weil, M.D., for instance, or Herbert Benson, M.D. – “The Relaxation Response”.

https://awcim.arizona.edu/education/catalog.html

We must ask, by the way,

WHAT IS MEANT BY “EVIDENCE-BASED” MEDICINE?

https://en.wikipedia.org/wiki/Evidence-based_medicine

For consider:

“Belief bias is the tendency to judge the strength of arguments based on the plausibility of their conclusion rather than how strongly they justify that conclusion.  A person is more likely to accept an argument that supports a conclusion that aligns with their values, beliefs and prior knowledge, while rejecting counter arguments to the conclusion. Belief bias is an extremely common and therefore significant form of error; we can easily be blinded by our beliefs and reach the wrong conclusion. Belief bias has been found to influence various reasoning tasks, including conditional reasoning, relation reasoning and transitive reasoning.”

https://en.wikipedia.org/wiki/Belief_bias