In general, for the accuracy of the physical examination, most physical examination items can not eat before the physical examination. However, some physical examination items do not require fasting, so you can eat before the physical examination, so whether you can eat before the physical examination should be judged according to the test items. Most medical examinations require fasting and water prohibition after dinner the day before, and about 8-10 hours of fasting, such as blood sugar, blood lipids, liver function, gastroscopy, colonoscopy, liver, abdomen, pancreas ultrasound and other examinations. Once you eat before the physical examination, these project indicators may be affected and changed, which will affect the test results of the project and cannot truly detect the condition of the body. For colonoscopy, gastroscopy and other examinations, after eating, the gastrointestinal mucosa can not be observed, and it will increase the risk of detection. However, there are also physical examination items do not require fasting, you can eat before these physical examination items, such as gynecological examination, breast examination, electrocardiogram examination, otolaryngology, ophthalmology, hepatitis B virus, urogenital system and other examination items. If you focus on the examination of these items, you can eat before the physical examination, and the examination results will not be affected. The day before the physical examination should pay attention to light diet, avoid ingesting spicy and stimulating food, but also pay attention to warmth. If you do not know exactly what tests are available, in order to obtain more accurate physical examination results, you should try to fasting.