Negative attitudes toward obese patients by health professionals have been attributed to termination of weight reducing attempts. This study measured attitudes concerning the obese held by professional participants in a continuing education conference on causes and treatment of obesity. Substantial variation was found on items comprising obesity-related belief dimensions: (a) Disparaging image of the obese; (b) causes of obesity; and (c) ways to lose weight. Evidence is presented for the association among measures of these dimensions. While background and educational characteristics and conditions of practice were not related to such attitudes, the professional's personal experience with successful weight reduction was the best predictor of favorable attitudes.