Nietzsche wrote quite a bit on this - philosophical outlook and physiological heath are very strongly correlated. Of course people can hold philosophical views

Nietzsche wrote quite a bit on this - philosophical outlook and physiological heath are very strongly correlated. Of course people can hold philosophical views dispassionately, with no real investment in them, but when you see someone like this, it really is a sick person. The best thing you can do for it is have some empathy for people that feel so miserable and who therefore remake the world in that image, and then move on. Reading it isn't good for you either - a single miserable person can ruin the day of many happy people.