Suggestion: You can go to the hematology department of the hospital for a blood test. If diagnosed, eat more iron-rich animal livers and kidneys. Followed by lean meat, egg yolk, chicken, fish, shrimp and beans.
Avoid spicy, cold and indigestible food. Usually you can supplement your body with a nourishing diet.
Diet should be regular and temperate, and overeating is strictly prohibited.