There are various methods of calculating standard weight, and the results obtained by each method vary. The standard weight is now commonly used in accordance with a calculation method promulgated by the World Health Organization, boys for [height (unit cm) – 80] × 70% = standard weight (kg), so a 174cm tall boy standard weight should be 65.8kg. standard weight is only a reference value, weight in the standard weight within 10% of the upper and lower are considered normal weight, beyond 10%-20% for The weight above 10%-20% is fat, below 10%-20% is thin. A normal weight allows the body systems to function better and helps maintain good health. Although there are many ways to change weight (such as medicine, surgery, etc.), these methods often have safety risks, and it is recommended that you can achieve a normal weight through scientific methods without safety risks. People who are fat can reduce greasy or calorie-rich diet (such as doughnuts, burgers, rice, etc.) and do moderate exercise to lose weight; people who are thin can enhance their physical fitness and adjust their weight by eating less and eating more and exercising appropriately.