Whether a person is fat or thin cannot be measured by eyes. You can calculate whether you are a little thin according to the following formula: the centimeter of height minus 100, and then multiply by 0.9, and the answer is my standard weight. If the individual's height is 180cm, the standard weight is (180-100) × 0.9 = 72kg, which is normal if it is lower or higher than the standard weight 10%. If your actual weight is lower than the standard weight 10% or more, you should consider whether you have lost weight.