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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.
My PET scan instructions were for a low carb diet beginning at dinner the night before the scan, and I was to have NO food or drink for 4 hours before the scan. Also, no strenuous exercise or accupuncture for 12 hours prior to the scan. You can have a small amount of water in the 4 hours before the scan. Make sure you don't wear clothing with zippers or other metal (I wore sweats).