Being skinny isn’t the answer.
Young girls who want to stay skinny aren’t prepared for womanhood. They want to keep their prepubescent figures, not ready to accept the challenges and responsibilities of adulthood. Guys who require that of women, want children for girlfriends and spouses, not adults. Forcing women to stay children is common to many cultures where men dominate. It’s a whole lot easier to dominate a child than an adult, so they keep their adult women children, by demanding they barely eat in order to keep the fat that goes along with womanhood off the bones they think they own.