This study presents the results of a psychological survey carried out in 1995 and 1996 in the Obesity Unit of IVth Department of Internal Medicine, General Faculty Hospital in Prague. There were 86 patients examined. The patients underwent a series of tests and questionnaires--Raven's Progressive Matrices, STAI, Miniscripts, Body Image. No significant differences were found between men and women. On the basis of this screening the general characteristics of obese patients hospitalized in this Unit can be described as follows: average to above average level of mental capacity for the general population, a need to "be strong and have everything under control", a need for recognition from other people, slightly increased level of anxiety. In their perception of their bodies they see themselves as overweight, unattractive and in a poor state of health.