A presentation, in the form of interviews and articles, of experts’ perspectives on a social phenomenon that can also constitute a genuine public health problem, particularly in developing countries where malnutrition is widespread. An examination of the impact of social and media pressures on the concept of an acceptable body image. Definitions of overweight and obesity, presentation of the components of associated eating behaviors and possible pathological effects. Brief description of the most commonly used weight-loss diets and their dangers, as well as serious approaches to treatment and the psychoanalytic support that may be associated with them. Advice on the specific problem of weight gain during smoking cessation.