The main component of red blood cells is hemoglobin, which binds to oxygen to perform oxygen-carrying tasks. The important raw materials for its synthesis include iron, folic acid and vitamin B12, etc. If the raw materials are lacking, it can lead to a decrease in red blood cell production, thus causing anemia. If you need to replenish red blood cells, you can eat the following foods: 1. Iron-rich foods: The main source of iron is food, so you can eat iron-rich foods such as pork, beef, mutton, lamb blood, pig blood, etc.; 2. Vitamin C-rich foods: The intake of vitamin C can promote the absorption of iron, which can replenish red blood cells faster. Daily intake of foods rich in vitamin C, such as oranges, strawberries, kiwi, kale, green peppers, broccoli, tomatoes and other fresh vegetables and fruits; 3. Foods rich in folic acid: such as green leafy vegetables, red meat (pork, beef, lamb, etc.), eggs, fish, milk, etc.; 4. Foods rich in vitamin B12: such as meat, animal offal, green leafy vegetables, fruits, etc. In addition, in daily life, do not be picky, do not be partial to food, pay attention to balanced nutrition and reasonable matching. However, food only has the function of preventing anemia, it cannot be used to treat anemia. Once anemia appears, you should go to the hospital as soon as possible to find out the cause of the disease and take regular medication.