If you want to gain weight in a healthy way and reduce dark circles under the eyes, it is important to focus on proper nutrition, sleep, hydration, and overall health rather than depending on quick remedies or supplements alone. For healthy weight gain, try to eat balanced meals regularly and include foods rich in protein and healthy calories, such as milk, curd, eggs, nuts, peanut butter, bananas, rice, dal, paneer, sprouts, dry fruits, and healthy homemade snacks. Eating small meals more frequently during the day can help if your appetite is low. Regular light exercise or strength training can also help build muscle and improve appetite instead of only increasing body fat. At the same time, getting 7-8 hours of good sleep every night is very important because poor sleep and stress can both prevent healthy weight gain and worsen dark circles. Dark circles under the eyes are commonly linked to lack of sleep, stress, dehydration, excessive screen time, allergies, nutritional deficiencies, or family tendency. Drinking enough water, reducing stress, limiting late-night screen use, and eating iron- and vitamin-rich foods such as green vegetables, fruits, dates, and nuts may help improve the appearance of the skin around the eyes. Applying a cold compress or a gentle under-eye moisturiser can give temporary freshness. If you are very thin, losing weight unintentionally, feeling weak, or if dark circles are severe and long-lasting, it is important to consult a doctor because conditions like anaemia, thyroid problems, poor nutrition, vitamin deficiencies, or digestive issues may be responsible. In many cases, improving daily routine, nutrition, sleep, and stress levels can help both healthy weight gain and the reduction of dark circles naturally.