Coronary CT does not require fasting, but do not overeat. Coronary CT is mainly used to check whether the coronary arteries are blocked by injecting contrast material intravenously, which is not directly related to whether or not you have eaten, and will not affect the accuracy of the test results. However, it is important not to eat too much, as this may cause nausea and vomiting during the test, which may cause discomfort to the body. Eating does not affect the results of coronary CT, the main factor is the patient’s heart rate. When the patient’s heart rate exceeds 70 beats per minute or more, there may be missed or misdiagnosis. Therefore, before the examination, patients must maintain a relaxed mood, avoid overfeeding or strenuous exercise, quit smoking and drinking, etc., so as to avoid affecting the accuracy of the examination results due to a fast heartbeat. If patients need to do coronary artery CT examination, it is recommended to go to a regular hospital, under the guidance of the doctor.