The normal weight of 1.58 meters is 46.2kg to 59.7kg, which is calculated according to our normal standard of body mass index (BMI) of 18.5 to 23.9. Body Mass Index (BMI) is an internationally recognized reference index for measuring fatness and thinness.BMI=Weight (kg)/Height (m)². A large BMI does not indicate weight loss. For example, the BMI of a person who exercises regularly may indicate overweight or obesity. This is because BMI is flawed and does not take into account the percentage of visceral fat. BMI in daily life is easy to calculate, highly maneuverable and widely accepted, and is commonly used to roughly assess physical status. If there is a large change in body weight within a short period of time, it is recommended to seek medical attention to rule out organic diseases.