The 21 Pounds in 21 Days diet is actually a detoxification program that results in weight loss. The goal is to cleanse your body, ridding it of harmful toxins, thus enabling your metabolism to function at optimal levels. Through this liquid diet, you can lose 21 pounds in 21 days by consuming a variety of liquids, such as water, broth, soup, and natural fruit and vegetable juices. The three main focal points of the 21 Pounds in 21 Days diet are rest, reduce, and rebuild. Reducing your intake of toxins allows the body to rest and rebuild itself so that is able to work properly.