Hello, Weight gain is, a gradual process and you should follow a natural diet along with good exercise. Increase protein and iron intake, in your diet. Rule out any deficiencies by getting blood tested. Have high calorie protein rich snacks at regular interval.

Take high protein diet. Take plenty of water every day. Take small and frequent meals at regular intervals of 2-3 hrs. Avoid outside food completely. Ask me directly for detailed diet plan for you. Take all milk and milk products, eggs, pulses, sprouts, nuts, tofu, rajmah, chole, soyabean, paneer, chicken, fish etc. to gain muscle mass.