Human eating: diagnosis and prognosis. 
Despite substantial recent progress, we remain without a comprehensive theory of human eating.  The constraining influence of the single-factor, hunger-satiety model of feeding in animals is addressed.  Three aspects of human eating--counter-regulation in dieters, the effects of social models, and the influence of distress on eating--are reviewed briefly, in an attempt to demonstrate that a simple hunger-satiety model cannot handle the data.  It is imperative that we consider social, cognitive, and other influences on eating as important casual agents in their own right; these influences are not necessarily mediated by their effect on hunger-satiety.  A comprehensive theory of human eating is not likely to appear soon, but there are grounds for optimism in the process (rather than the final result) of research.