ABSTRACT Eating disorders – anorexia nervosa and bulimia nervosa are one of the multi factorial disorders which are affected by genetic, neural, social and psychological factors. These factors themselves don’t have independent existence and found to interfere with each other in order for the development of disorder. In this review, causes of eating disorders is been mentioned. Both of the major disorders also don’t have independent nature and are connected to each other. It acts like a cycle of symptoms where one symptom brings to the other kind of disorder. These disorders are not something new and dates long back to history. Importantly, recent times have created a keen interest among biologists and scientist to know genetic basis of these disorders where the information enrichment is also going on by hormonal and neural changes which are slowly and slowly accessed. Certain hormones such as leptin, adiponectin found to be affected in the case of disorder. Societal and familial aspects are also reviewed which is of obvious importance. This review is important for Biology, Psychology and Sociology point of view.