Bayberry is rich in vitamin C, glucose, fructose, citric acid, etc., so the sweet and sour taste, bayberry rich in potassium (150 grams of iron per one hundred grams of potassium) on summer sweating can play a potassium effect. Since ancient times, there have been "Yangmei Litchi" in the Wuyin area. From the perspective of food taste, bayberry is warm, sweet and sour, and enters the lungs and stomach. It has effects such as thirst, stomach digestion and antiemetic spasm. Eat more Yangmei will be "fired." Chronic gastritis patients with excessive gastric acid secretion, gastric ulcer patients should not eat on an empty stomach, so as not to cause excessive acid secretion induced worse. People with poor basal glycemic control in diabetes are advised not to eat it. Patients with ideal basal glycemic control may occasionally receive a small amount of food 2 hours after a meal, 3 pills at a time. (Because of 100 grams of bayberry sugar 5-7 grams, energy is about 30 kcal). Constipation patients recommend eating less.