it is weird you guys are talking about monks in paleodonks journal, i will share my one monk experience that kind of ties in and maybe gives him a few ideas?
i worked on a farm and studied under a monk who was originally a collegiate rugby play(he was a really strong man, large frame, HUGE JAW! excellent features, excellent specimen really!) surfer and also had had a past of abuse and womanizing. he was reformed from that, celebate and raw vegan and seriously as docile as a puppydog, although behind his eyes you could still tell there was something or atleast used to be something incideous....what sucked was he was already on a diet that could not provide his body with the proper protein for the amount of work we did(12-14hr days on a farm no motorized tools, manual haul of supplies(dirt, algae, compost, produce, hay) miles at a time) and although he was a highly intelligent it took him a very long time to get out a comment, to complete ideas, and the less he ate the more dim he would become. when he would eat it would be like 5000000lb's of fruit, nuts, salad and oil and then his stomach would become bloated and he would have guilt for being "glutonous" and then fast again! it think that fasting and extreme diets like this are OK in the short term and perhaps can help rid the body and personality some extreme traits that are really just a result of hormone, histamine and cortisol levels, but that one must eat meat and fat to feed the brain!! he definitely cured his agression and womanizing and was a beautiful generous soul(which he was all along, just out of balance!) i think in the long term they put the body out of balance much more
you have to think that most monks do not do much physical labor when fasting because they are often in the practice of prayer and meditation at that time so they dont require much more then water to keep hydrated