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Foods to Eat Before a PET Scan. A PET (positron emission tomography) scan is a powerful process for detecting cancer. Cancer cells grow extremely fast and need a lot of glucose. A doctor will inject the patient with glucose, and the PET scanner detects if any cells are emitting signs of high glucose use. If you eat before your PET scan, you risk throwing your glucose levels off balance and getting inaccurate results.
The PET scan is able to measure blood flow, oxygen use, glucose metabolism (how your body uses sugar), and much more. A PET scan is typically an outpatient procedure, meaning that you will be able to go about your day after the test is complete.