making ur body go on an extreme diet does more harm than good
walk first, jog, then run
instead of forcing urself to eating the tiniest things, just cut off unhealthy foods and replace them with a healthier choice
at her age, she is still growing, so cutting down the source of nutrients/energy and running of fumes won't really help her development
but then again, manga likes to throw these "diets" at people and then BAM, skinny MC is loved by all
really reinforces unhealthy dieting/exercise and can affect mental health
then again, just my opinion, not a doctor but im speaking based off of experience