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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.
What do I eat the day before? My husband has had several PET scans and was never told to be on any special diet. The only thing he had to do was having nothing to eat or drink 6 hours prior to the scan. He was able to have a few sips of water, since his radiation damaged his saliva glands and his mouth was very dry. If you are diabetic you may need to find out if any special prep.