Outlook on life, I am a bit sceptical about these explanations according to which most everything comes from the mind.
That approach gives us a comforting feeling because it makes us believe we have a great degree of control in what happens to us healthwise. We just need to have a good mindset and everything will work out fine. Not so!
I had a very good outlook on life when I was healthy, it changed when I got repeatedly sick with CFS/disbyosis.
My lifestyle has always been good, I never drank one drop of alcohol--can't take it--, never smoked, ate a balanced diet of natural foods, hate artificial/processed foods and drinks anyway, never abused my body in any way.
Nevertheless, from my forties on, I had repeated gut problems, allergies, etc. Lots of people I know who abuse their body badly have a much better health than me; grossly unfair! :-D
My mother died from an allergic reaction to antibiotics, my grandmother had repeated intestinal problems, all my grandparents died in their 60s.
I feel I am the victim of bad genes essentially; I manage to keep a positive outlook most of the time--I don't want to add depression to my woes--but this positive mindset does little to heal me.