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You need to eat protein rich diet like cereals, pulses, eggs, chicken, lean meat carbohydrate
rich food like bananas, mangoes, chikoos, oranges. Eat green leafy vegetables as well for antioxidant effect and prevent deficiency diseases. Exercise by bradual weight bearing exercises to help put on muscle mass in the right proportions. You can also consult a Doctor regarding Weight gain Appetite stimulants after a proper examination of you and required tests. GOOD LUCK !!!!