Sam is a 22-year-old graduate. He moved to a new city after his studies and started living on his own. His current job is extremely demanding and stressful. Over the past three months, although he controls his food intake during the day, he has been gaining weight. He has also noticed leftovers and dirty dishes in the kitchen when he gets up in the morning even though he hardly eats at home. In this scenario, Sam is exhibiting symptoms of _____.