plums produce phlegm and help dampness, so people with spleen and stomach weakness, hyperacidity, gastric and duodenal ulcers, and weak body and qi should not eat more. People with gastrointestinal indigestion should eat less, and excessive consumption will cause mild diarrhea; Plums contain hydrocyanic acid, and eating too much can cause poisoning. Immature and bitter plums are inedible; Li Ziji should be eaten with roe meat, sparrow meat, honey and duck eggs.