lol it's not quite occultic. It's a genuine part of psychological Science and is used for many related things like quitting smoking. In fact it could be argued that while one of the main arguments against it for smoking- it's short term effects- would actually not be an issue with fasting because the effect of the hypnotism doesn't need to last beyond the fast itself.
So while I agree with you that it is certainly not needed for fasting golthing, for some it may well be worthwhile investigating. I guess the trick would be to find a psych prepared to hypnotise you into not eating, they might consider that a bit dangerous. ;) Or maybe there is a self hypnotism option available. :)