Liquid diet to lose weight means replacing staple food with liquid food for a period of time (replacing rice, bread and other high-starch foods with porridge or soup). Liquid food generally includes: juice, porridge, soup, water and other liquid or semi-liquid foods. This type of food is good for digestion, will not hurt the stomach, and can be nutritionally comprehensive. After you lose weight on a liquid diet for a period of time, your stomach will gradually become smaller, you will eat less, and you will be successful in losing weight.