Eating has no effect on the hepatitis B antibody test. At present, the main tests for hepatitis B antibodies are the five hepatitis B indicators, which can be performed before or after meals. For normal people who are negative for hepatitis B surface antibodies, they need to get the hepatitis B vaccine in time. Most patients will have antibodies after receiving the hepatitis B vaccine, and these people are protected from hepatitis B infection. A small percentage of patients who have received the hepatitis B vaccine but are antibody-negative will need to continue receiving the vaccine, and some may even need multiple vaccinations to produce antibodies. In some people, the antibody titer decreases from year to year and is determined by the value of the antibody titer, and if it is less than 100 IU, a booster shot is required.