Weight is most accurately measured in the morning, on an empty stomach, and after emptying the bowels. At this time, various factors have less influence on body weight and the value is most accurate. A person’s weight is affected by factors such as the amount of food eaten, the amount of water consumed, urination, defecation, and physical exertion, etc. Measured at different times of the day, the weight value will be different. It is normal for a person’s weight to fluctuate within 2 kilograms during the day. The most accurate time period for weight measurement is usually in the morning, after waking up, last night’s food has been metabolized, urination, defecation, fasting, do not drink water, it is best to measure at the same time every day, so that the measured weight is the most accurate. If the weight continues to rise or fall in a short period of time, it is not normal, and you should go to the hospital in time to find out the reason.