I am 28 years old vegetarian 52 kms weight lean how to increase weight and body dimension to a moderate range?

See Dr. and 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 also doing weight-training to increase muscle. Proteins and fats are needed, such as olive oil, peanuts, almonds, beans, tofu, etc...