Researchers at the U.S. Department of Energy’s Brookhaven National Laboratory have found new clues to how the brain and the stomach interact with emotions to cause overeating and obesity. By looking at how the human brain responds to “fullness” messages sent to the brain by an implanted device that stimulates the stomach, the scientists have identified brain circuits that motivate the desire to overeat in the obese — the same circuits that cause addicted individuals to crave drugs.