This paper reviews several psychological models to explain disturbed food intake: the "psychosomatic theory", the "stimulus-binding theory", the "concept of restraint eating", closely related to the "concept of latent obesity", the "set-point-theory" and the "boundary model". All are based on the assumption that there are biological regulating processes of body weight (and with this also of feelings of hunger, appetite and satiation as the determinants of food intake), nevertheless the resulting body weight can be inconsistent with social standards and individual self-concepts. In this case a cognitive control of food intake (dieting behaviour) is activated for weight regulation, which in turn interacts with biological regulatory mechanisms, and as a result leads to specific behavioural dispositions which can be supported by experiments.