My friend is starving herself to lose weight please help

she tried evey diet she could find, she exercised, she tried everyting to lose weight and she could not shed the weight and now se doesn't eat at all and exercises to the point she can't stand I don't know what to do, she's losing weight but I know the way she is doing I s dangerous. please give me advice on what I should do now
My friend is starving herself to lose weight please help
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