Eating disorder in both over weight and under weight?

In my opinion, someone who is over weight can have a eating disorder. It's not really common in over weight people because most don't see it as that. If you think about it, both are causing damage to themselves. I classify myself as having a eating disorder because I truthfully feel as though I do it for the same reason as an anorexic girl would do it for. I over eat because of severe depression.I've been turning to food my whole life. I have 5 siblings and I'm the only one who grew up over weight with a mental disorder. I want to know what your thoughts are. Do you believe that an over weight person can have a eating disorder just like someone who is thin?