I don't find this surprising personally, the psyche is an underrated aspect of one's immunity. Thoughts govern the body more than mere commands or receiving sen

I don't find this surprising personally, the psyche is an underrated aspect of one's immunity. Thoughts govern the body more than mere commands or receiving sensory "data". If one feels unwell "in his head" then that means he is actually unwell or eventually the body will "adjust" to his perception: feeling unwell, or at least not optimal. Similarly the opposite is probably true: having a clear mind probably helps more than not.