Handling health certificate requires some physical examinations, such as measuring height, weight and blood pressure, as well as some biochemical indicators, such as blood sugar, cholesterol and liver function. Therefore, in order to ensure the accuracy of the examination results, it is usually recommended not to eat at least 8 hours before handling the health certificate to keep an empty stomach.
If you eat before the examination, the food will be digested and absorbed, which will affect the biochemical indexes in the blood and make the examination results inaccurate.