Based on your height and weight, your body mass is quite low, indicating that you are underweight. Gaining a healthy weight is important for overall well-being. Focus on increasing your daily calorie intake with nutritious foods rather than junk food. Eat more frequently and include energy-rich options, such as rice, whole wheat, potatoes, milk, curd, nuts, seeds, eggs, pulses, and chicken or fish if you eat non-vegetarian food. Adding healthy fats like peanut butter, ghee, and olive oil can also help. Light strength exercises such as squats, push-ups, and resistance training can help build muscle mass in a healthy way. Your hair changes may be linked to poor nutrition, especially low protein, iron, zinc, or vitamin intake, or to stress or thyroid imbalance. Make sure your diet is balanced and includes fruits and vegetables daily. Drink enough water and avoid excessive heat styling or harsh shampoos. If your weight remains low or hair changes persist despite these measures, please consult a doctor for a proper evaluation to rule out underlying conditions and receive appropriate treatment if needed.