1. If you want to gain weight, first know whether you need to gain weight or not. Calculate your body mass index (BMI) to find out if you are underweight. BMI is measured based on height and weight.
2.Lack of proper nutrition is also the most common reason for being underweight. The amount of calories, protein, fat, carbohydrates and other important nutrients you consume has a direct effect on your body weight.
5. Physicians and dieticians suggest high intake of protein which helps in weight gain, intake of protein rich foods like chicken, fish, variety of fruits and vegetables, diet products, beans, pulses, potatoes, eggs etc.