1. In general, a health certificate is a health certificate for eating in the morning. The most important thing is to see if there are infectious diseases and liver problems. Under normal circumstances, as long as you get up early, don't eat meat or animal food, it won't affect the test results.
2. Generally, to apply for a health certificate is mainly to test blood routine and enzyme markers of hepatitis B and C, and make an electrocardiogram, so this has nothing to do with eating. If you have the habit of eating in the morning, you can eat normally without affecting the test results.