In this discussion of childhood obesity, the medical and psychological problems associated with the condition are noted. Childhood obesity most likely results from an interaction of nutritional, psychological, familial, and physiological factors. Three factors--the family, low-energy expenditure, and heredity--are briefly examined. Early intervention is recommended with a focus on physical activity, diet management, and behavior modification. Parent education is also recommended as a means for preventing obesity in children. References are listed. (JD)