What to Eat Before a Colonoscopy

Why diet matters before a colonoscopy

The goal of colonoscopy prep is to completely clean out your colon so your doctor can see the lining clearly. What you eat in the days leading up to the procedure plays a big role in how well that works.

By gradually reducing fiber and hard-to-digest foods, you give your body less material to clear out. This typically means an easier prep experience and a cleaner colon, which helps your doctor do the best job possible.

3 days before — low-fiber diet

Most protocols ask you to start a low-fiber (also called low-residue) diet about three days before your procedure. Low-fiber means avoiding foods that leave behind undigested material in your colon.

What "low-fiber" means

A low-fiber diet typically limits you to about 10–15 grams of fiber per day. You're essentially choosing refined, easily digestible foods over whole, unprocessed ones.

Low-fiber foods by category

Category	Good choices
Proteins	Eggs, skinless chicken, turkey, fish, tofu
Grains	White bread, white rice, plain pasta, saltine crackers
Dairy	Milk, yogurt (no fruit chunks), cheese, cottage cheese
Fruits	Canned peaches, applesauce, ripe banana, melon
Vegetables	Well-cooked carrots, green beans (no skin), potatoes (peeled)

2 days before — further restrictions

Two days before your procedure, you'll usually want to stick even more closely to low-fiber foods. Some doctors ask you to drop raw fruits and vegetables entirely at this point.

Keep portions moderate. This isn't the time for a big steak dinner or a heavy meal. Think simple, bland, and easy to digest.

Stay well hydrated. Drinking plenty of water and clear fluids now will help you feel better during your liquid-only day tomorrow.

Day before — clear liquids only

The day before your colonoscopy, most protocols switch you to clear liquids only. This is the final step before starting your prep solution.

Clear liquids include water, clear broth, black coffee or tea (no milk), apple juice, white grape juice, sports drinks, clear gelatin (not red or purple), and popsicles (not red or purple).

For a detailed breakdown of what counts as a clear liquid and tips for getting through the day, see our clear liquid diet guide.

Simple meal ideas for low-fiber days

Breakfast ideas

• Scrambled eggs with white toast
• Plain yogurt with a ripe banana
• Cream of wheat or grits with butter
• Pancakes or waffles made with white flour (light on syrup)

Lunch ideas

• Turkey and cheese on white bread (no lettuce or tomato)
• Chicken noodle soup with white noodles
• Plain pasta with butter or a smooth sauce
• Grilled cheese sandwich on white bread

Dinner ideas

• Baked chicken breast with white rice and well-cooked carrots
• Fish with mashed potatoes (no skin)
• Plain pasta with grilled chicken
• Scrambled eggs with white toast (breakfast for dinner works great)

Morning of the procedure

Most doctors require you to stop drinking all liquids at a specific time before your procedure — typically 2 to 4 hours beforehand. This is for your safety during sedation.

Your doctor's instructions will specify exactly when to stop drinking. Follow that time precisely, even if you're thirsty.

What to eat after your colonoscopy

After your procedure, your digestive system needs a gentle reintroduction to food. You've just been through a thorough cleanout, so go easy.

Good first foods

• Crackers, plain toast, or dry cereal
• Soup or broth
• Scrambled eggs
• Plain chicken or fish
• Bananas, applesauce
• Mashed potatoes

What to avoid on the first day back

• Spicy foods
• Heavy, greasy, or fried foods
• Raw vegetables and high-fiber foods
• Alcohol
• Large portions — eat small amounts and see how you feel

Most people can return to their normal diet within a day or two. Listen to your body and ease back gradually.