Glucose Acts as a Brake on Food Craving (IMAGE) Yale University Caption Brain reward regions are activated when glucose falls below normal levels (blue). In lean people -- but not obese people -- the prefrontal cortex which is involved in decision making and regulating impulses is activated (red) when glucose levels are normal. Credit courtesy Kathleen Page Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.