Eat breakfast before vaccination. Vaccination is usually intramuscular and subcutaneous, and the injected drug will not be affected by eating. And skipping breakfast or eating a bad breakfast may cause the body’s blood sugar level to decrease, making it easy to have a hypoglycemic reaction with symptoms such as dizziness, palpitations and shivering. It may also lead to lower brain excitement and failure to provide sufficient energy for the body, and some people may have dizzy reactions due to emotional stress during vaccination, etc. It can be seen that skipping breakfast or eating a poor breakfast may increase the chance of adverse reactions. Therefore, people who are preparing for vaccination can eat, drink water and eat breakfast normally to avoid the consequences such as low blood sugar and dizziness. In addition, the vaccine entering the body to stimulate an immune response will produce a certain amount of antibodies and form the corresponding cellular immune memory, giving the body the ability to fight the disease. This process also requires the body to have sufficient capacity to support it, so it is important to eat breakfast before the vaccination to replenish calories. In addition, before and after the vaccination, you should keep regular rest and rest, avoid excessive fatigue, staying up late, eating too much fried and smoked food, and drinking stimulating foods such as alcohol, strong tea and coffee to avoid reducing the body’s immune response to the vaccine. It is also recommended to have a light, high-protein breakfast on the day of vaccination, including eggs, milk and fresh vegetables and fruits, and not too much.