Overeating without weight gain can be due to habit, fast eating, or high metabolism. To control it, try eating slowly, using smaller plates, and stopping when you feel about 80% full. Include more protein and fibre (dal, eggs, vegetables), so you feel satisfied longer. Avoid distractions like mobile/TV while eating, and drink a glass of water before meals. Keeping fixed meal timings and healthy snacks can also help prevent overeating. If it feels uncontrolled or linked to stress, consider talking to a doctor or nutritionist for guidance.