A member asked:

Could it be a sickness wanting to be underweight?

A doctor has provided 1 answer

Maybe: If you are obsessed with the idea of being very thin, and dislike eating as a result, then this may be the start of anorexia nervosa, which is a life-threatening disease. If you just want to be able to see your muscle definition and don't care about mass, like justin bieber (photo), and you're otherwise quite happy with yourself, "underweight" is just a number & u could be making a healthy choic.

Answered 12/10/2013

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Thank

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How can I be underweight but not have an eating disorder?

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