If the main purpose of lumbar CT is to observe lumbar spine lesions, being able to eat in the morning has no effect on the examination. If it is to observe organ lesions, eating has some effect. When doing lumbar spine CT, it is possible to do the examination at any time of the day, and whether or not you eat or drink has no effect on the examination. Lumbar spine CT is mainly to observe whether there is any damage to the bony as well as non-bony structures in the lumbar region. For example, after trauma, lumbar CT mainly observes whether there is fracture of vertebra, transverse process, spinous process, etc., and whether the fracture block enters into the vertebral canal after fracture and compresses the spinal cord and nerves. If the CT lumbar mainly observes the abdominal lesions, the intestinal lesions may be affected to some extent after eating, so the examination should be performed on an empty stomach.