Over weight Teen Girl ~ Please Help!!

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I'm writing this post because I need guidance on how to help my over weight teen sister. Its not that I care about her weight other than health issues, but its her happiness. I know what her eating is emotional, and she has no idea how to control it. She is very insecure about it and extremely defensive when you try to talk to her. Her parents are also concerned and try to help but not being extremely healthy themselves, are not very successful as role models.

If there is anyone who has dealt with this, please HELP!!

Its at the point that she is always sneaking candy and hiding the wrappers all over the house. She will deny that its her. She gets extremely excited when talking about food, cakes, deserts, snack food... and acts as tho she has not had junk food in soooo long...

She is an amazing girl with a heart of gold! I love her so much and wish I could help her.