Eating the same plate of food as a hepatitis B patient is generally not contagious, but there is still some risk. Hepatitis B is mainly transmitted through blood contact, sexual contact, and vertical transmission from mother to child. Therefore, it is generally not contagious to share a dish with a patient. However, if a patient with hepatitis B bleeds heavily from the mouth and contaminates the dish, and if there are wounds or more obvious breaks in the mucous membranes in the mouth of people who are not protected by hepatitis B antibodies, it is possible for these people to be infected when they come into contact with these dishes, but the risk is low. In conclusion, hepatitis B needs to be prevented, and the general population should be actively vaccinated against hepatitis B to produce antibodies for prevention. When coming into contact with hepatitis B patients, blood and sexual contact should be avoided.