Kylo suffers from a restrictive eating disorder; either Rey or hex tries to help

Bonus points if:
-Leia appears in the story (and is motherly but a total badass)
-kylo has gone back to the light side (if it's reylo.) if it's Kylux he can be dark af
-his romantic partner doesn't cure him, they just try to help/are concerned
-Kylo has had to hide this from snoke in the past