Water will be freely available throughout the day. Every 30 minutes subjects will be asked to complete a set of visual analogue scales designed to assess subjective mood and satiety, a 15ml blood sample will be taken for the measurement of glucose, insulin, ghrelin, free fatty acids, glucagon, cholecystokinin (CCK), Glucagon-like peptide 1 (GLP-1), cortisol, adrenaline and noradrenaline. A 3ml sample will be taken every 15minutes for the first 90 minutes, for the analysis of insulin and glucose. A baseline sample for triglycerides and cholesterol will be taken at the beginning of each study visit. Cognitive tests (measuring attention reaction times and vigilance) will be completed 0, 45, 90 and 135 minutes minutes after the provision of breakfast. After 180 minutes, the cannula will be removed and subjects will be free to leave the lab.