Contents: Preface. F.P. Brooks, Regulation of Gastric Secretion--Neural Mechanisms. N.W. Bunnett, J.H. Walsh, Regulation of Gastric Secretion. D. Novin, Neural Models of the Control of Food Intake. G.P. Smith, Humoral Mechanisms in the Control of Eating and Body Weight. A.S. Levine, J.E. Morley, Function of Opioid Peptides in the Brain and Gut. Y. Taché, Central Nervous System Action of Neuropeptides to Induce or Prevent Experimental Gastroduodenal Ulcerations. S.F. Leibowitz, Opioid, (alpha symbol, subscript 2)-Noradrenergic and Adrenocorticotropin Systems of Hypothalamic Paraventricular Nucleus. H. Weiner, The Functional Bowel Disorders. S.H. Ackerman, Peptic Ulcer Disease. C.P. Herman, Discontrol of Appetite and Satiety--Social and Psychological Factors in Obesity: What We Don't Know. A.J. Stunkard, The Regulation of Body Weight and the Treatment of Obesity.