A day without food is useful, which can reduce excess water in the body and have a certain effect on detoxification, but be careful not to exceed three days. Health care, weight loss, three days, detoxification for seven days. Is it useful to spend a day in the valley? Is useful, can reduce excess water in the body, but also has a certain detoxification effect, but be careful not to exceed three days. Health care, weight loss, three days, detoxification for seven days.