Generally speaking, red beans and barley water can be consumed all year round, but the best effect is to drink it in spring and summer and in the morning. Red bean and barley water has the effect of removing dampness, diuretic, edema, etc. The air contains a lot of water vapor in spring, which makes people feel humid and stuffy, so drinking it at this time can dispel dampness and strengthen the spleen; the weather is hot in summer, and the body is prone to edema and heavy dampness, so drinking it at this time can relieve edema and enhance appetite; the stomach absorbs better in the morning, and red bean and barley can be eaten as breakfast. Therefore, it is recommended that people with dampness in their bodies can drink red beans and barley water in early May until October. But it is not recommended to drink red beans and barley water after meals, because it has a certain role in strengthening the spleen and stomach, drinking before meals can promote the spleen and stomach function transport, and also before going to bed is not suitable for drinking, otherwise it will cause an increase in night urination and affect sleep. In addition, red beans and barley water can be consumed for a long time, but not every day, barley and red beans are cold food, too much consumption will cause diarrhea and other symptoms occur, Yin deficiency body is not recommended to eat more.