Oyster sauce, walnut and spinach

Spinach contains large amounts of beta carotene and iron, and is also an excellent source of vitamin B6, folic acid, iron and potassium. Spinach leaves contain chromium and an insulin-like substance, which acts very similar to insulin and keeps blood sugar stable. The rich B vitamin content makes it able to prevent angular stomatitis, while beta carotene can prevent vitamin deficiencies such as night blindness. Spinach contains a large amount of antioxidants such as vitamin E and selenium, which has anti-aging and cell proliferation effects. It can not only activate brain function, but also enhance youthful vitality, help prevent brain aging and prevent Alzheimer's disease. A Harvard University study also found that middle-aged and elderly people who eat spinach 2 to 4 times a week have ingested carotene (i.e., pro-vitamin A, because it is called vitamin A in animals and pro-vitamin A in plants), which can reduce the risk of retinal degeneration, thereby protecting vision.