According to the standard BMI value, the best weight for a 173cm tall girl is between 55 and 71.5kg. It is very important to maintain your weight within a healthy range. Obesity can lead to a variety of chronic diseases, such as hypertension, coronary heart disease, fatty liver, etc. Too little weight can also affect your health, causing symptoms such as decreased immunity, osteoporosis and depression. Low body weight can also affect your health, causing symptoms such as decreased immunity, osteoporosis, depression, etc. Low body weight can also lead to stunted growth in children and adolescents. Maintaining weight within the normal range should be done: 1. Weigh yourself regularly and control your weight in a planned manner. 2. Formulate a scientific and reasonable diet plan with reference to the Dietary Guidelines for Chinese Residents. 3. Exercise regularly to help your physical and mental health, burn up excess energy and strengthen your body’s immunity. 4. Maintain a good work and rest schedule and lifestyle Note: Please do not resort to unhealthy dieting methods such as hunger strikes because of weight anxiety.