1. Eat more foods rich in folic acid or supplement folic acid. Such as animal liver, dark green leafy vegetables (such as cabbage, turnip and lettuce), broccoli, asparagus, citrus fruits, juices and beans.
2. Eat foods rich in iron. Such as animal liver and lean meat. Other foods such as black fungus, red dates and day lily also contain a lot of iron.
3. Ensure the intake of iodized salt and eat more seafood. Such as fish, shrimp, shellfish, kelp, seaweed and so on.
4. Quit smoking and drinking.