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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.
I read in MEN'S HEALTH that don't drink caffeine 24 hours before a PET SCAN becaused caffeinated beverages before a PET scan may obscure the view of vital organs. I was told not to eat or drink like after Midnight and to have a low carb diet the night before (I think for the tracer to work better).