I have a report that's due tomorrow. Not the best planning skills, I know, but it's on the effect of eating disorders on your grades, and I'm having a hard time coming up with information.

Lol tell her you're bulimic and couldn't get to it.

XD

I am interested to know if eating disorders just mean losing weight. Such as anorexia and bulimia.
So do they just mean trying to lose weight?

No. In order to be diagnosed with an eating disorder there are a few criteria that needs to be met. Anorexia nervosa is characterised by extremely low body weight and body image distortion with an obsessive fear of gaining weight. So, it isn't just about losing weight. It's a psychiatric illness.

I am writing a social science essay on the contributing factors of eating disorders (ex. media) and I need to write it in a thesis to help me further my research for the essay. Any help is welcome

From people around us. We are easily influenced, and believe what we see. Media plays a huge role in this, as the majority of population believes the repeated image. Soon, everyone is affected, and the masses build eating disorders, such as anorexia, and bulimia.

People want to look like the models on television, and try to transform themselves. Or maybe their parents/peers are pressurizing them to change their appearance. They might also have complex regarding their figure.

If you had said in general, then it'd be passed on from birth, family history, etc.

Does anyone know of a case study that supports the psychoanalytic approaches view on the cause of eating disorders?

You will have to check with your school for the complete article, but here's the abstract:
A dramatic long-term psychoanalytic treatment of a psychotic character disorder is presented in detail. This patient began therapy with a long standing history of an eating disorder for which she had received many hospitalizations and forms of treatment without any success. She was in a deep despair and as a last resort agreed to a psychoanalytic therapy. During the many years of treatment the eating disorder completely resolved but was replaced by a series of very dangerous accidents that occurred each time she was betrayed and disappointed by a boy friend. This went on pari passu with a deepening understanding of her childhood and her psychodynamics but the middle of the therapy was very stormy and required tenacious efforts to maintain the treatment. The self-destructive behavior was traced to early and profound childhood disappointments and a sense that these were her fault because she was so unlovable and therefore deserved punishment. A dangerous stalemate developed in the treatment after a number of years. The analyst presented the case to colleagues several times and wrote it up in detail, which enabled him to understand his own countertransference and resolve it. This resulted in a dramatic change in the patient and a very favorable and happy ending to this very difficult treatment after 15 years. Although the author believes all patients in psychoanalysis should be approached with as neutral and objective a stance as possible, emphasizing free association and dream material in order to interpret the crucial childhood determinants of the patient's psychopathology, in cases such as psychotic character disorders the outcome clearly also depends on interpersonal factors. The case illustrates the deep partly conscious and partly unconscious interaction between a patient and her analyst over many years of treatment and the profound effect this has on the outcome. It underscores the importance of patients being allowed to heal in their own way and in their own time without intrusion or interference from the analyst. It also demonstrates the crucial importance of long-term psychoanalytic therapy as a life-saving procedure in cases where it is appropriate in spite of the great amount of time and expense involved.
Chessick, R. (2007, December). Long-term psychoanalytic therapy as a life-saving procedure. The American Journal of Psychoanalysis, 67(4), 334-358.

Approximately how many teenagers are hospitalized every year for eating disorders in Canada? Or around the world?

I'm sorry I don't know the answer. I tried looking on google but couldn't find the answer. I would imagine it would be a pretty large number. All I can suggest is trying to search the internet. Good luck! Hope this helps! =)