Self-other positioning was investigated in a group of obese youths in order to empirically test the clinical hy-pothesis – based on the constructionist theory of Family Semantic Polarities – that obese people are affected by a negative self-perception and low self-esteem. Repertory grid technique was used with 30 participants (15 obese-overweight and 15 control) to elicit and compare their personal constructs and assess, via ad hoc measurement indices, the positions they as- signed to the self and significant others in relation to these constructs. The results confirmed the research hypotheses, with obese subjects displaying a tendency to pos ition both self and others at the negative pole of bipolar constructs and report- ing greater self-ideal discrepancy. These findings and their limitations are discussed in relation to their clinical applica- tions and in light of the methodologi cal issues arising from the study.