The Best Pre-Colonoscopy Diet

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On October 1, 2025

If you have an upcoming colonoscopy, you’ll have to change your diet a few days before your exam. That’s why knowing which foods to eat before a colonoscopy can help your procedure go as smoothly as possible.

A colonoscopy is an exam where your doctor uses a scope with a camera on the end to look at the inside of your colon. It can find irritated tissue, ulcers, polyps, cancer, and other gastrointestinal diseases like Crohn’s or ulcerative colitis, according to the National Institute of Diabetes and Digestive and Kidney Diseases.

Accordingly, it’s essential to follow your colonoscopy prep diet guidelines to make sure your doctor gets an unobstructed look at your intestines. Here’s everything you need to know about your pre-colonoscopy eating plan, including which foods to snack on, which to avoid, and menus to follow.

Stock up on the best pre-colonoscopy foods and plan out your diet before your colonoscopy. That way, you can focus on clearing out your digestive system without having to worry about meal prep in the days leading up to your exam.

Pre-Colonoscopy Diet Plan

You should start to alter your diet about five days before your procedure so your body has time to properly clear out, according to the Colorectal Cancer Alliance (CCA).

Here are some diet tips to keep in mind prior to your colonoscopy.

1. Eat Low-Fiber Foods

Eat a low-residue (or low-fiber) diet in the days leading up to your colonoscopy, according to StatPearls. A low-residue diet limits fibrous foods — which tend to leave remnants in your digestive tract — so your colon is as clean as possible come procedure time.

Most colonoscopy prep instructions recommend starting this diet three to five days before your procedure, so check with your doctor about when you should begin to eat low-fiber foods like:

Chicken
Fish
Eggs
Tofu
Refined grains like white rice, white bread, and plain crackers
Potatoes
Applesauce

At the same time, cut out high-fiber foods like:

Nuts and seeds
Raw fruits and vegetables with skin
Certain vegetables like broccoli, Brussels sprouts, and kale
Whole grains like bread, pasta, brown or wild rice, cereals, shredded wheat, and granola
Legumes like beans, lentils, and peas

StatPearls also recommends limiting or avoiding other high-residue-diet foods such as milk and milk products like ice cream.

A low-residue diet (for colonoscopies or other procedures) should be followed for only a short period of time unless your doctor recommends otherwise, according to the Mayo Clinic. It doesn’t supply enough fiber and other nutrients to keep you nourished in the long term.

2. Stop Taking Supplements and Certain Medicines

The CCA recommends you stop taking medicine with aspirin and ibuprofen six days prior to your procedure, and hold off on vitamins and herbal and iron supplements five days beforehand. That’s because your doctor wants to see what your colon looks like without the help of health-supporting medicines and supplements.

You can continue to take most prescription medications in the days before your procedure, according to the CCA. Just tell your doctor which medicines you take so they can let you know if there are any specific instructions to be aware of pre-colonoscopy.

3. Follow a Liquid Diet

The day before your exam, you’ll consume only clear liquids, per the CCA. This is vital to help your doctor get the best view possible so they don’t miss any polyps and so you don’t have to repeat the procedure in the near future, according to the Mayo Clinic.

4. Stay Hydrated

Make sure to stay well hydrated in the days before your procedure, according to the CCA. Drink plenty of water or other hydrating beverages like tea (without milk or creamer) — particularly on the day of your laxative prep — to replenish any lost fluids.

Sample Menus for Before Your Colonoscopy

Five days before focus on the aforementioned items. Unsure what you can eat for your colonoscopy prep? Here are some options to consider.

1. Option One

You can still eat somewhat normally a few days before a colonoscopy, as long as you start to cut down on fiber. Kaiser Permanente recommends eating only low-fiber foods. Here are some meal options to try.

‌Breakfast:‌ Eggs with white toast
‌Lunch:‌ Turkey sandwich on white bread and baked potato with skin off
‌Dinner:‌ Grilled chicken thighs, sautéed mushrooms, and white rice cooked in chicken broth

2. Option Two

You’ll start to eat fewer solid foods in the two days before your colonoscopy. The CCA suggests the following:

‌Breakfast:‌ Cream of wheat with a side of honeydew melon cubes
‌Lunch:‌ Turkey sandwich on sourdough bread, applesauce
‌Dinner:‌ Orecchiette pasta

3. Option Three

You can’t eat any solid foods the day before a colonoscopy, according to Kaiser Permanente. Instead, you’ll need to follow a clear liquid diet, which includes fluids like:

Pulp-free juice like white grape or apple
Electrolyte sports drinks (light colors)
Clear sodas like ginger ale
Tea or coffee (without milk or cream)
Low-residue desserts like ice pops, fruit ice, fruit-flavored gelatin, or Jell-O
Clear soups and broths like vegetable, beef, and chicken broth or bouillon
Clear nutrition or protein drinks

That doesn’t mean you can have just any liquids the day before a colonoscopy, though. Steer clear of the following foods that can leave residue in your colon, such as:

Milk and other dairy products
Juice with pulp, like orange or prune juice
Ice pops made with chunks of real fruit
Soups with vegetables, noodles, rice, or cream
Anything pureed that is cloudy or creamy
Alcohol
Red, blue, and purple liquids

You’ll also take a prep laxative the day before (and usually the day of) your colonoscopy to flush out the remaining contents of your colon, according to Kaiser Permanente. Follow the instructions on your prescribed laxative, and take it at home, where you’ll have constant access to a bathroom.

What to Expect the Day of Your Colonoscopy

You’ll have to stop drinking any liquids — including water — about two hours before the exam. Have a loved one drive you to and from your procedure. You’ll be sedated for the exam, which typically lasts about 30 minutes, according to the Cleveland Clinic.

Afterward, you’ll chat with your doctor in the recovery room to discuss any findings. If they took a biopsy of your colon, you should get those results within a few weeks.

You can eat solid foods again right after your procedure. Resume normal activities, like driving and exercising, after 24 hours.

Eat to Prevent Colon Cancer

A colonoscopy is a key way to detect colorectal cancer, which is the third most common cancer diagnosed and the third leading cause of cancer-related deaths in the U.S., according to the American Cancer Society.

In fact, a study from the New England Journal of Medicine ‌found that colonoscopy screening lowered colorectal cancers by 31 percent.

Lifestyle choices like a healthy diet and regular exercise may also help lower the risk of cancer. Here are some anti-cancer diet tips to keep in mind:

Eat mostly plant-based meals.
Limit red meat and stay away from ultraprocessed meats like bacon and sausage.
Eat plenty of fiber.
Limit alcohol.

Even if you have a healthy lifestyle, make sure to follow your doctor’s recommendations about getting regular colonoscopies. The American Cancer Society suggests having your first screening at age 45 if you are at average risk, with exams every 10 years after that. If your doctor considers you to be at higher risk due to genetics or a family history of gastrointestinal disease, check with them about how often you should have your exam.

Still not sure what foods you can eat in the days before a colonoscopy? Discuss your diet with your doctor to make sure everything you plan to eat is in line with their recommendations.

Takeaway

A colonoscopy is an exam where a healthcare provider uses a scope with a camera on the end to look at the inside of the colon.
Be prepared by having pre-colonoscopy foods on hand.
Stick to a low-fiber diet before a colonoscopy.
Stay hydrated.
Speak to your doctor about current medications and supplements you are taking.