The psychiatric morbidity – endogenous and exogenous psychoses, neurosis and abnormal personalities, psychosomatic diseases, addictions, sociopathies and so on – is studied mainly on first grade relatives in 6 cases of female patients affected with anorexia nervosa, 2 monozygotic twins; 2dizygotic twin and 2 cases of anorexia nervosa on non-twin sisters.

On both patients and their families, cathamnesic study has been made and the syndrome-shift or psychiatric polysyndrome coincidences-alterations have been estimated.

Finally, results and genetical and clinical findings are discussed in the scope of etiological theory of anorexia nervosa.