Hello first of all you need to increase your total calories intake and include one physical activity. Please avoid junk food as it is observed that this kind of food is nutrient deficient and can be the reason of not gaining weight. So try to eat home-cooked food increase the portion size in every meal, take fruit juices, take mango or banana milk shake specially after doing exercise. Sleep for at least 8 hours or can take afternoon nap if you have time, don't take stress. Take chwanprash on the regular basis, if you follow you can see the difference in one month. Good food source of protein are egg, chicken, fish, oatmeal, daal, legumes and nuts.
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