I am manoj from india, iam looking very lean how to put some fat

See Dr., then eat...: If one is truly underweight (based on height, family background, and body type), a Dr. can evaluate for a hormonal, digestive, or other disorder. If no medical cause is found, then one can add weight by eating more calories of nutritious foods, while doing weight-training to increase muscle. Better fats: olive oil, peanuts, almonds, tofu, .... Proteins: if past kidney stones, eat vegan proteins.