The benefits of drinking barley tea include replenishing water as well as vitamins and other nutrients. 1. Hydration: Barley tea itself is a traditional refreshing drink, and every 100g of barley tea contains 99g of water, because barley tea drinking can help the body to replenish water. 2. Supplementary nutrition: barley tea is a drink made of barley, containing protein, vitamin B1, niacin and a variety of trace elements. 100 grams of barley tea (tea itself) contains 77.6 grams of carbohydrates, 13 grams of protein, 3.4 grams of fat, the total calorie is 305 calories. Therefore the intake of the various nutrients contained in barley tea can actually help the organism to replenish some nutrients. Although it is said that barley tea has some nutritional value, it should not be consumed in excess, which can easily lead to bloating and so on, and it is important to note that you can’t drink overnight tea.