You can't drink beer when it's expired. First of all, beer that exceeds the shelf life will first change in taste; Secondly, expired beer contains a variety of acids, which are easy to oxidize and polymerize with protein, which makes the beer turbid and causes harmful bacteria such as Escherichia coli and pathogenic bacteria in the wine to exceed the standard. After drinking expired beer, it is easy to have symptoms such as headache, diarrhea, vomiting and even food poisoning. Other uses of expired beer: 1. It can keep flowers fresh. Because beer contains nutrients such as ethanol and sugar, adding a little beer to the container of flower arrangement can prolong the fresh-keeping period of flowers. 2. Soaking dark clothes in water with some beer can soften the clothes and restore the original color. New clothes don't change color easily after soaking. 3. Beer is slightly acidic, which can adjust the pH of the soil and make the acid-loving flowers grow more luxuriantly. Pour a small amount of beer directly into the flowerpot. Beer contains barley and hops. Washing hair with beer can make hair soft, shiny and dandruff-free. Before shampooing beer, you can wash your hair with shampoo, and then soak or rinse it with water added to the beer.