My body very weak . my age is 24 but wait very less only 49. can u suggest anything for improve my wait.

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 also doing weight-training to increase muscle. Proteins: egg white, chicken breast, salmon, ... Better fats: olive oil, peanuts, almonds, tofu, ....

Concerning: Your symptoms of weakness and low weight are concerning. We think of a broad array of causes: infection, rheum disorders, malignancy, even stress and depression can do this. You need a thorough exam by your doctor including blood tests- please get checked!