Adolescence is a period of intensive changes and adolescents very often act unpredictable because of their body and psychological changes . Consideringon many changes, from look, identity development, fitting in society and growing up, it's very sensitive age in which very often occur different psychological disorders of which are the most eating disorders.Anorexia and bulimia are the most common disorders in the diet but lately everybody talks about orthorexia. Anorexia nervosa is a psychological disorder in which young girls in fear of weight gain beginning deliberately lose weight to a state of severe physical exhaustion and real-life threat.Bulimia nervosa is psychological disorder which is the most common in young girls. Marked by the need of overeating large amounts of high-calorie food. After overeating followed by deliberately vomiting which happens because of fear of gaining weight and dissatisfaction with the appearance of your own body. Orthorexia is a disorder of pathological focuson healthy food. There are numerous causes of these disorders,but common to them is that only one of the causes can't lead to disorder because it must be their plexus. Factors of eating disorders divided into biological, socio-cultural and psychological. The most common biological factors are age, sex and body weight. The most common psychological factors are self-respect, image of own body and perfectionism. Social factors which havethe most influence on developement disorders in eaitng are social pressure toward thinness, changed social role of women, the glorification of eating disorder, prejudices against owerveight and tendency of social comparison. Treatment is extremely difficult and complicated,therefor, would be much better to notice the warning signs and try with prevention of the disturbance. If the disorder has already developed then there are more types of treatment like external treatment, day hospital, residential treatment and hospitalization.