What is a healthy weight range?

1. At present, there is no unified standard weight data in China. There are two commonly used calculation methods: one is: adult: (height (cm)- 100] * 0.9 = standard weight (kg); The other is: male: height (cm)- 105 = standard weight (kg), female: height (cm)-60. In addition, the Academy of Military Sciences also introduced a method to calculate the ideal weight of China people: the ideal weight of northerners (kg) = (height cm- 150) x 0.6+50, and that of southerners (kg) = (height cm- 150) x 0.6+48. This calculation method seems to be more suitable for people in northern and southern China. The simple method to calculate the standard weight of children is: 1 ~ 6 months: birth weight (kg), ten months old * 0.6 = standard weight (kg); 7 ~ 12 months: birth weight (kg) ten months old x 0.5 = standard weight (kg); 1 year or older: 80 years old x2= standard weight (kg). However, because people's weight is related to many factors, there are differences among different people, and there will be certain changes at different times on the same day. In addition, geographical location (such as gravity), season, climate and their own situation also have certain effects on their weight, so it is difficult to fully reach the standard weight. In other words, it is difficult to express it with a constant value, but it should be a range of values. We call this numerical range a normal value, which is generally within the range of +- 10% of the standard weight. Beyond this range, it can be called abnormal weight. The measured weight exceeds the standard weight, but the excess is less than 20%, which is called overweight; If the measured weight exceeds 20% of the standard weight and the fat percentage (F%) exceeds 30%, obesity can be diagnosed. If the body weight exceeds the standard weight by 30%-50% and the F% exceeds 35%-45%, it is called moderate obesity; Those who exceed the standard weight by more than 50% and F% by more than 45% are called severe obesity. 2. Body mass index method Body mass index = weight (kg) divided by the square of height (m) kg/m2 Normal weight: Body mass index = 18-25 Overweight: Body mass index = 25-30 Mild obesity: Body mass index >; 30 Moderate obesity: body mass index >; Severe obesity: body mass index >; 40