Preparing for a colonoscopy involves a crucial step: a strict diet to ensure your colon is completely clean. A clean colon allows for a clear view, which is essential for an accurate diagnosis and detection of any abnormalities. Many people are confused about what they can eat and drink, especially regarding water and coffee.
This guide will clarify the dietary restrictions leading up to your colonoscopy. Following these guidelines is vital for a successful procedure.
Why Is the Diet So Strict?
A colonoscopy uses a camera to examine the inside of your colon. Any residue from food can obscure the doctor’s view, potentially leading to missed polyps or lesions, and might require you to repeat the procedure. Therefore, adhering to the diet is not optional but essential.
Common Misconceptions
“I only need to fast the day before.” Incorrect. To ensure a thorough cleaning, you must start a low-residue diet at least 3 days before the procedure. Fasting only on the day before is often insufficient to clear all food residue.
“Colored drinks are okay.” Absolutely not. Beverages with coloring, such as purple, red, or orange juices, can stain the colon walls and interfere with the examination. Stick to clear liquids only.
Key Dietary Guidelines: What to Eat and Avoid
Here is a clear breakdown of what is allowed and what is forbidden during the preparation period.
✅ 3 Days Before ~ Lunch on the Day Before: Low-Residue Diet
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Allowed Foods: White rice, white rice porridge, white bread (crust removed), castella cake, eggs, tofu, white fish, clear broth (no solids).
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Foods to Avoid: Brown rice, black rice, multigrain rice, kimchi, vegetables (namul), bean sprouts, seaweed (laver, kelp), fruits with seeds (watermelon, melon, grapes, kiwi, strawberries, etc.), nuts, corn.
✅ Evening Before ~ Day of Procedure: Clear Liquid Diet & Fasting
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Evening Before: Usually, a light meal of white porridge or thin rice gruel is eaten around 5-6 PM, followed by fasting. (Follow your hospital’s specific instructions).
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Water: Drink plenty of water until the day before to prevent dehydration. On the day of the procedure, you can drink water only while taking the bowel preparation agents. Do not drink anything, including water, starting 3-4 hours before the scheduled procedure time. (Confirm the exact time with your hospital).
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Coffee: Mix coffee is absolutely forbidden. Black coffee (Americano) without sugar or cream might be okay in small amounts up until the morning of the day before, but it’s not recommended due to dehydration risks. Do not drink any coffee starting from the afternoon of the day before the procedure. It’s safer to avoid it to prevent any potential staining.
Practical Tips for Taking Bowel Prep Agents
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Chill It: Drinking the prep solution cold can help mask the taste.
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Use Clear Mixers: If permitted by your doctor, mixing the solution with a clear, light-colored sports drink instead of water might make it easier to drink.
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Suck on Candy: Chewing gum or sucking on hard, clear peppermint candy between doses can help with nausea.
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