Is it really true that several different saints in history underwent fasting to the point of becoming emaciated? The big three that come to mind are St John Chrysostom, St Francis of Assisi, and St Kateri Tekakwitha, though there are others. St Chrysostom and St Tekakwitha both died fairly early deaths.
This is kind of a moral problem for me. Should we view this behavior in them as morally exemplary, when - by the same token - some people have a disorder (anorexia) that leads to the same end, and it is something that is treated in clinics? Did these saints “go too far” beyond what prudence would dictate?