Watermelon cultivation has a long history. More than 4000 years ago, the ancient Egyptians began to grow watermelons. Watermelon's hometown is in the tropical desert of Africa, and later it was introduced into northern Europe from the Mediterranean coast and entered the Middle East, India and other places. Watermelon has been planted in China for over 400 years. Introduced from the western regions in the 4th and 5th centuries, it was called watermelon. Watermelon not only quenches thirst and is nutritious, but also has high medicinal value. "Compendium of Materia Medica" records that "watermelon is sweet in taste, cold in nature, enters the heart and spleen meridians, and has the effects of clearing away heat and relieving summer heat, quenching thirst and relieving annoyance. Indications: heatstroke, fever, vexation and thirst, and dysuria. It can also treat diseases such as hypertension, nephritis, hepatitis, cholecystitis and jaundice. " According to "Edible Materia Medica": "Watermelon is cold and detoxified, and is known as natural white tiger soup." It can be seen that watermelon is a good medicine for relieving summer heat. Eating it regularly in summer can prevent heatstroke and also have an auxiliary treatment effect on other fevers. Nutritional value of watermelon 1 Watermelon is rich in nutrition. According to nutrition experts, watermelon pulp contains 94. 1g, protein 1.2g, carbohydrate 4.2g, cellulose 0.3g, inorganic salt 0.2g, calcium 6mg, phosphorus 100g and iron 0.2. Vitamin B 10.02mg, vitamin B20.02mg, vitamin PP0.02mg, vitamin C3mg, and also contains a lot of fructose, glucose, sucrase and rich malic acid, phosphoric acid, glutamic acid, citrulline, arginine, carotene, lycopene and so on. , is an indispensable nutrient for human body. 2 the medicinal value of watermelon watermelon is sweet and cold. Has the effects of relieving summer-heat, promoting salivation, quenching thirst, promoting diuresis, and detoxicating. Therefore, it is known as "White Tiger Decoction", which is a good medicine for treating heatstroke, hypertension, nephritis, urinary tract infection, aphtha and other diseases. For patients with "Bitter Summer Syndrome" who lose appetite and lose weight in the summer heat, eating appropriate amount of watermelon can help digestion, promote metabolism and nourish the body; Watermelon seed kernel contains protein 19.2%, which has the functions of clearing away lung-heat, moistening intestines, harmonizing middle energizer and quenching thirst. It is an important medicine for intestine, stomach and spleen, and has curative effect on hemoptysis, hematemesis, menorrhagia, hypertension and acute cystitis. Watermelon peel is extremely rich in nutrition, containing various sugars, amino acids, lycopene, carotene, vitamin A, vitamin B, vitamin C and so on, which has high utilization value. In particular, the dried mesocarp is a Chinese herbal medicine "watermelon Cui Yi", which has the function of clearing away heat and promoting diuresis. It can be seen that watermelon is not only a daily table fruit, but also has high medicinal value.