Objective: To assess psychiatric morbidity, personality profiles and saliva cortisol levels in overweight and obese individuals at dietician clinic. Method: This cross-sectional study is based on individuals who attended dietician clinic between June to November 2008. They had completed questionnaires that included General Health Questionnaire 30-items, assessment for psychiatric illness using Structured Clinical Interview for DSM-IV and personality profiles using Personality Assessment Schedule. Saliva and body mass index were taken. Results: Of the 102 patients, 16 (15.7%) were diagnosed to have psychiatric illness. There were no differences between obese and overweight patients in terms of personality traits and psychological problem. Presence of psychiatric illness was associated with higher mean body mass index. Saliva cortisol levels were not elevated in patients who had psychiatric illness. Conclusions: Psychiatric illnesses are common in individuals who seek weight treatment. Careful psychological evaluation is important at (or before) commencement of a diet program.