Height 1.7 meters weight 53.5 ~ 69kg range of normal, according to China’s body mass index (BMI) health standards for 18.5 ~ 23.9 calculated, BMI = weight (kg) / height (m)². Body mass index is a common reference index at home and abroad to measure the degree of fatness and thinness, BMI large does not necessarily mean that you have to lose weight, BMI because it does not involve visceral fat and total body fat ratio, there are defects, the BMI of people who have been exercising regularly for a long period of time may be judged to be overweight or obese. Visceral fat is associated with the risk of cardiovascular events and metabolic disorders. Waist circumference, waist/height ratio and body fat percentage are commonly used in clinical studies to assess the level of visceral fat and determine obesity status. In conclusion, the calculation of BMI is simple, easy to operate, widely accepted, and can be used to roughly assess the physical status in daily life. If the weight fluctuates greatly in a short period of time, it is recommended to consult a doctor in a timely manner, and not to lose weight blindly on your own, so as not to affect your health.