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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 had a pet scan last week and was told to take it easy the evening before, eat a low-carb diet for lunch and dinner the day before and to fast (excet for water and meds) for six hours before the scan. Reply Report post.