Human weight will appear circadian and rhythmic changes and changes, in general, the weight at night will be heavier than the morning, fluctuations in 1-2kg within the normal phenomenon. Because when people get up in the morning, they have slept all night, have not eaten, and are in a fasting state, fasting state for more than 8 hours is the state of internal consumption, and consumption, at this time the factors affecting weight is less. When you get up in the morning, you will also metabolize and excrete, and this is when the weight is the lowest point of the whole day. As time goes by, people will drink water, eat, etc., and will increase their weight because of the water intake, and will also increase their calories because of the food intake, and will increase their basal metabolic rate with exercise. So after going through the cycle of the day, the weight at night will be about 1kg heavier than in the morning.