The summer climate is humid and sultry, and the diet should be bitter, pungent and sour. Bitterness can clear away heat and purge fire, strengthen temper and eliminate dampness. Such as bitter gourd, lettuce, asparagus and so on. It has the effect of clearing anxiety and refreshing the brain. Sweating in summer is the easiest way to lose body fluids. Drinking more water will dilute stomach acid. Eating some sour food, such as tomatoes, lemons, strawberries, dark plums, grapes, etc., can stop sweating, promote fluid production, strengthen the stomach and promote digestion, and prevent excessive sweating, gas consumption and yin injury. If vinegar is added to dishes, it can also sterilize and prevent gastrointestinal diseases in summer. This is the easiest way to keep fit in summer.