Sun Simiao, a famous medical expert in the Tang Dynasty, once said: "Chestnut, the fruit of kidney, kidney disease should be eaten;" Raw food cures waist and feet. " Li Shizhen, a medical scientist in the Ming Dynasty, said in his famous medical work Compendium of Materia Medica that eating chestnuts can replenish qi and blood, nourish the stomach, tonify the kidney and strengthen the liver and spleen; Raw food also has the effect of treating sore waist and legs, relaxing muscles and activating collaterals, and chestnut also has the effect of expelling cold and stopping diarrhea. Its nourishing function to human body can be compared with that of ginseng, astragalus and angelica, and it is cheap and easy to get, so it has been highly praised by doctors in past dynasties.