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â eggs, oatmeal (or whole grain cereal, or a piece of wheat toast with peanut butter), and fresh fruit or juice. Also, beware of coffee or other caffeinated drinks before the test as they tend to have the same detrimental effects as sugar, with unpredictable boosts of energy/jitters followed by crashes and fatigue.
1 Do not eat for 8 hours before starting the test, then eat normally for the next 24 hours. You can drink water. 2  The health care provider may ask you to stop taking medicines that can affect the test.  You cannot have intramuscular injection B12 within 3 days before the test.