Beer is the main raw material of barley malt, the rice is the starch type auxiliary material, and adds the hops, after the liquid gelatinization and the saccharification, after the liquid fermentation is made. Its alcohol content is low, contains carbon dioxide, rich nutrition. It contains a variety of amino acids, vitamins, low molecular sugars, inorganic salts and enzymes. These nutrients are easily absorbed by the body. The low molecular sugars and amino acids in beer are easy to digest and absorb, producing a lot of heat in the body, so beer is often referred to as "liquid bread". L12 1 ° Bx beer, can produce 344 kj heat, equivalent to 3 ~ 5 eggs or 210 g bread produced heat. A light manual laborer, if he can drink 1L of beer a day, can get a third of the calories he needs.