Beer is made from malt and barley malt as main raw materials, adding hops, liquid gelatinization and saccharification, and then liquid fermentation. It has low alcohol content, carbon dioxide and rich nutrition. It contains a variety of amino acids, vitamins, low molecular weight sugars, inorganic salts and various enzymes. These nutrients are easily absorbed and utilized by the human body. Low-molecular-weight sugars and amino acids in beer are easily digested and absorbed, which produces a lot of heat energy in the body, so beer is often called "liquid bread".