What can the little sister do if her big sister is secretly suffering from a eating disorder?

Tell some one a eating disorder is no joke she needs to get her help and yes she might get mad but she well get over it and thank her in the long run

If the big sister wont do anything about it, maybe you could look up on ways to help her.
I think the best thing would be to tell the parents, even if its not what the big sister wants you to do, and may get annoyed with you, in the long run the parents will be able to help and get her help.

the younger sister really needs to let someone kno about the eating disorder because that is a serious problem and can cause serious health issues..
a person with a disorder like that cannot overcome it and needs help..
please let someone kno so the sister can get the help she needs before its too late

then the little sister should tell some one important who can help her or find ways to help her, because a eating disorder can lead to death over time. the bigger sister needs to b monitored so she can get better over time. at first she will resent you for telling on her but you will only be helping her

tell your parents - it may seem like a huge no no but with something as serious as that you need to maturity level of an adult to step in. She may hate you forever but you'll know that you did the right thing and that never sticks with you like doing the wrong thing and having something horrible happen... Good Luck!

well, thats kinda a broad question, so for a real broad answer, i'd say, first, talk to her about it. i know its kinda weird..but try and ask her why and talk to her about it basicly, i mean, ur (or they, whoever u r talking about, u, or someone else) sisters afterall, and its always cool to be real close to a sister.and then just tell ur parents, especially if it gets real bad or serious, cuz you defientely dont want her to get sick or have anything bad happen. hope that helped a little!