Usually, the fastest way to lose weight is in the first three days, and all you can lose is excess water in your body, while fat is hard to lose. Therefore, in the first three days, it decreased by 2~3 kg per day on average, and on the fourth day, it began to burn fat, with an average decrease of 1 kg. Therefore, you can lose about 8~20 kg in 7 days, depending on the physical condition of the valley digger.