There are many ways to calculate the standard weight, and different criteria exist for determining it according to different human races. The standard weight of 170cm male can be roughly estimated by using the standard weight (kg) = height (cm) – 105, which means that the standard weight of 170cm male is about 65kg. The BMI is calculated by dividing the height of a person by the square of his or her body weight, and the value obtained is the body fat percentage. The standard body fat percentage is 18.5-23.9. In China, if the BMI is <18.5, i.e. a male with a height of 170cm and a weight of less than 53.5kg is considered underweight, and if the BMI is ≥24, i.e. a male with a height of 170cm and a weight of more than 69.4kg is considered obese. The World Health Organization's weight calculation standard for boys combines the relatively rigorous calculation method deduced from the characteristics of different human races in the world. The formula is: standard weight = [height (cm) - 80] × 70%, so the standard weight of 170cm male is about 63kg. if less than 63kg is considered underweight, more than 63kg is considered to be overweight. In general, underweight boys may have malnutrition problems, mainly manifested as yellow and thin, easily fatigued, etc. Therefore, it is necessary to properly increase the intake of nutrition, such as food containing high protein and high quality fat, such as eggs, meat, etc. For overweight boys, it is recommended that the daily dietary intake of calories, in the normal standard can be, you can eat less and more meals, gradually, with physical exercise to reduce weight, to maintain physical health also has a positive effect.