 Beyond the purely physiological effects of surgery, there is an increasing understanding that removal of the stomach or oesophagus has a profound effect on a persons appetite and eating behaviour. This likely results from the central action of gut derived hormones, and is an area of significant interest in the obesity field. Anecdotally, post-gastrectomy patients frequently report minimal appetite and significant changes in their food preferences. At present, this has not been characterised in a scientifically rigorous fashion. A variety of tools exist to assess the motivation and impulsivity of a persons relationship to food in a non-invasive fashion, which can be administered from home, or as an adjunct to a gut hormone secretion test. 