How do I help the most important person in my life?

Kid-girl
I love my best friend more then anything I consider her more like a sister to me. But she wants to go on this crazy diet. She came up with this thing where she'll eat every other day. If she does this she can hurt her body. She thinks she fat but she's not. She's short and thick no where near fat. I try to tell her that its not right but I don't think I'm say it the right. So do anyone know ant ways I can talk her out of this? Because I don't want to see her get hurt.
How do I help the most important person in my life?
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