Why do people who eat and purge behave like that?

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It is not necessarily just depression nor mental disorder. Anorexia/Bulimia is an illness brought on for a lot of reasons
I have suffered with both and although i am better than i was, i am still not recovered. For me, because i restricted for most of the time,and over exercised, the hunger was sometimes too much to bare with, my mind would 'switch' off and i would eat untill full, but of course no person with an eating disorder in that state would keep the food in, hence the purging happens
from what ive heard, purging releases a hormone in the brain causing it to become addictive if done too often

A lot of the time people act this way out of self destruction.

Sometimes, when you feel vulnerable, scared of the world, or just feel out of control of your life, the one thing you CAN control, is your body, by disguising it, or damaging it. Whether that be drug abuse, excessive drinking, self harm, starving yourself or taking no care of the important things like having a home.
I've done all of these things myself. I've felt physically and mentally vulnerable, and suffered with manic depression for several years, and in some way, this almost becomes the one saving grace. It's the feeling that at least you have something. You become comfortable in the fact that there is definitely something about yourself, and that's vulnerability.

But that's not always the case. It can be out peer pressure, seeing things in media and other people making comments that can make people purely image conscious, which can go from a small feeling of wanting to look a little different, to an unhealthy obsession.

I hope this might help some people to understand how people develop mental illnesses like in this vary film.

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