The weight of the human body will change throughout the day, when to weigh the most accurate, should be the morning, after the morning toilet, the body’s waste out, have not eaten, this time weighing relatively accurate, but also the true weight. As breathing usually takes away part of the water, skin sweating and so on will make the water loss, so the weight will be higher at night. The general weight change will be 2-3 pounds, so it is recommended that the best time to weigh is in the morning after defecation.