A colonoscopy is a medical procedure used to look inside the colon to check for inflammation, growths or early signs of colorectal cancer. A long, flexible tube with a video camera tip, called a colonoscope, is inserted into the rectum. The physician is able to see inside the colon by way of the camera and may take tissue samples for biopsy or remove polyps if needed. You must follow colonoscopy preparation guidelines, which include following a special diet a few days before the exam.
Roughage
Roughage foods may leave residue inside the intestine, which can interfere with the colonoscopy. A diet low in roughage is recommended three to four days before your colonoscopy, according to the University of Virginia Health System. Foods to avoid include vegetables, fruits that contain skin or seeds, nuts, corn, popcorn and whole-grain products, including whole-grain bread. Fruits and vegetables may leave residue inside the colon, while seeds and grains may lodge inside the colon and interfere with the exam. Instead, choose low-roughage foods like white bread, pasta, skinless fish and poultry.
Red or Purple Dye
Foods or liquids containing red or purple dye should be avoided before your colonoscopy, as the dye may be mistaken for blood during the exam, states MayoClinic.com. Dyes may be found in foods like gelatin desserts or candies, liquids such as drink mixes and tea or in medications. Refrain from consuming red or purple dyes at least 24 hours before your colonoscopy.
Solid Foods
Colonoscopy preparation requires that all solid materials be removed from the intestine before the exam. Twenty-four hours before the exam, a liquid diet is recommended to prevent solid waste from forming. Appropriate liquids include clear broth, coffee without creamer, water and plain tea, suggests MayoClinic.com. You may also choose gelatin or popsicles that do not contain red or purple dye. Avoid dairy products including milk or cream and carbonated beverages.
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