Eating in the middle of the night up to 6 to 8 hours the next day is considered fasting. Different tests have different requirements for fasting time, for example, fasting blood glucose test requires at least 8 to 10 hours of fasting, liver function test requires 8 to 12 hours of fasting, gastroscopy requires 6 to 8 hours of fasting. Therefore, if in the middle of the night if you eat something you can’t reach the required fasting time, it can’t be considered a completely fasting state. Failure to maintain sufficient fasting time will affect the accuracy of the test results, so if the night after eating food it is recommended to change the time of the examination, to maintain sufficient fasting time before the examination. If there is any abnormality in the test results, you can go to the hospital.