I’ve not heard of it, but I can see where being away from home for a full year, under enormous pressure can make anyone lose their appetite.
Add to that, the need to be a size <whatever>, and the conditions are ripe for a crisis.
True, few things can stave off a clinical condition. But for most cases, going off with a good sense of self and frequent contact with / to home can be a huge source of emotional support.
That, and tefillos. Lots and lots of tefillos.