Can drink, of course, also depends on the situation, how you are saved, this should not need too much explanation, you should understand yourself, soybean juice is originally fermented products, and will not be like other food spoilage claims. In the past, there is a joke, said Qi Hua Men (Chaoyang Gate) outside the barracks of the flag people are gathered in the street crying and weeping, passers-by asked, crying the more painful, said "soybean juice children's room are closed Zhang, do not want to live?" Jokes to jokes, the old Beijing people, especially the flag people, especially love to drink bean juice, and even called "life food" is a fact.　As the saying goes, Beijing people are "bean juice mouth", "old rice mouth", "brine shrimp mouth", that is, the so-called "Beijing three mouths! The so-called "Beijing three mouth".　It is said that the introduction of bean juice is in the early Qing Dynasty, when a powder room to do mung bean flour, in the heat of summer, grinding out the semi-finished bean juice that day was not used up, the next day that has been fermented, to take a little taste, feel and sweet and delicious, and then boiled, drink more beautiful, so they specialize in making up bean juice to sell.　People buy bean juice, add purple old rice (hamlet rice) or leftover old rice, boiled into a bean juice porridge, accompanied by different small dishes, become the capital is unique to a flavorful snacks.