Ever wonder why obese people just don’t stop eating so much? New research suggests that their continual exposure to food—called habituation—actually makes them less able to feel full. Essentially, they become so used to food that it takes more of it to experience a sense of satisfaction. Their satiation is impaired, which hinders their ability to regulate the amount of food they eat. This research is especially important in understanding how to treat binge eaters or patients who have undergone bariatric surgery.