Meal Plan: What To Eat A Day Before A Colonoscopy (1 Day Before)

Unsure what to eat a day before a colonoscopy? In this article, Dr. Akintomiwa shares his meal plan for what you should and should not eat the day before your procedure.

Deciding what to eat a day before a colonoscopy is an important part of ensuring a successful and productive outcome from your upcoming procedure. While proper preparation can be daunting, appropriate nutrition is critical to ensuring reliable results that you can depend on.

The day before a colonoscopy is a critical time to eat recommended meals that align with the goals of bowel preparation while still supplying necessary nutrients. This article will walk you through the process, providing appropriate food selections and highlighting the necessity of medically acceptable options for effective bowel cleaning.

This article was originally published January 2024, and updated August 2025 to improve reader usefulness and readability.

Why Should You Plan What To Eat A Day Before A Colonoscopy?

During the week leading up to your colonoscopy, you will follow different colonoscopy meal plans, transitioning from low fiber to clear liquid diet. The day before your colonoscopy, you will need to follow a clear liquid diet and consume bowel-prep solutions to thoroughly cleanse your colon.

Adequate bowel preparation is the cornerstone of a successful colonoscopy preparation. Compliance with dietary rules and recommendations is key to effective bowel preparation. It is essential to stick to the recommended dietary plan before a colonoscopy to ensure that the colon is adequately prepared for the procedure. The main reasons for this are:

1. Proper cleansing of the colon allows your examiner to get a clear view of the colon lining, thereby increasing the accuracy of the examination.
2. Accurate colonoscopy results dictate the following line of action.
   • If the results show no pathology, preventive measures are either put in place or continued, and the subsequent screening appointment is scheduled.
   • Results that show a true positive – the actual presence of an abnormality – prompt your medical team to begin therapeutic efforts to manage the disease and increase survival chances.

Reasons to Follow a Pre-Colonoscopy Meal Plan

Pre-colonoscopy meal planning is vital for adequate colonoscopy preparation. Sticking to the recommended diet helps in the following ways:

Hydration

During bowel preparation, water is lost due to drug-induced frequent stooling. The clear liquid diet adopted the day before your colonoscopy helps keep you hydrated, counterbalancing the fluid loss.

Nutritional Balance

While preparing for a colonoscopy, it is crucial to maintain proper nutrition. A day before the procedure, the pre-colonoscopy meal plan typically includes clear liquids and easily digestible foods that provide essential nutrients and clear liquid diet suitable proteins, without leaving residue in the colon.

Safety

Eating the wrong foods before a colonoscopy can put your safety during a colonoscopy at risk. For example, alcoholic drinks can interfere with the action of the sedatives used during colonoscopy and alter their effects.

Comfort

A meal plan tailored for colonoscopy preparation can help minimize the discomfort experienced during the procedure. This is because you get to avoid certain foods that can exacerbate gastrointestinal discomfort during colonoscopy. An empty colon also reduces obstructions during a colonoscopy; the easier it is for the colonoscope (the long, flexible instrument used to observe the colon) to navigate the colon, the less uncomfortable the procedure. Also, knowing that you have carefully done your due diligence in preparing for the procedure can help reduce any feelings of anxiety surrounding the colonoscopy.

Meal Plan: What To Eat A Day Before A Colonoscopy

As mentioned earlier, the recommended diet for the day before a colonoscopy is a clear liquid diet. A clear liquid diet is a diet that is comprised strictly of clear foods and drinks. The “clear” meals are specified because they reflect the lack of fiber in the food. The “liquid” requirement is to facilitate easy digestion and absorption. Hence, a structured meal plan for the day before a colonoscopy will include some foods like:

• Water
• Transparent carbonated soda drinks, e.g., Sprite, 7Up, Mountain Dew
• Clear broth (chicken, bone broth or vegetable)
• Black coffee or tea without milk
• Apple juice, White grape juice
• Watermelon Sorbet
• Hazelnut & Black Espresso Jello
• Maple Coffee Slushie

A clear liquid diet is a restrictive diet. However, incorporating a variety of clear liquid foods into your meal plan helps make the diet more tolerable while keeping you hydrated, nourished, and energetic. Below is a sample of a structured meal plan for what to eat a day before a colonoscopy – you can find detailed recipes for some of these clear liquid diet meal options here.

RELATED ARTICLE: What Is Clear Broth Colonoscopy Soup? Examples & Recipes

What to Eat a Day Before A Colonoscopy (1 Day Before)

On the day before the colonoscopy, you may be given some laxatives as a part of your bowel preparation. The laxative helps to expel any residue and fecal material in the colon. Therefore, drinking lots of water (as much as six to eight glasses) on the day before the colonoscopy is advisable. For tips on helping you drink the colonoscopy prep liquid, see our article on how to make colonoscopy prep taste better and easier to drink.

EARLY MORNING (12am – 6am)

• Two glasses of water to cleanse your gut as you start your day
• A hot and refreshing cup of black coffee (you can add a bit of sugar or a generous amount of honey) to start your day

MORNING (6am – 10 am)

• A glass of flavored or sparkling water to keep you going
• A glass of maple coffee slushie (see recipe) for a quick boost of energy

MIDDAY (10 am – 2 pm)

• Flavored water to continue staying hydrated
• Refreshing, ice-cold watermelon sorbet (see recipe)
• Gelatin snacks, e.g., Jell-O, gummy bears

AFTERNOON (2 pm – 5 pm)

• A warm bowl of bone broth for lunch – chicken bone broth (see recipe) or beef bone broth (see recipe)
• Vegans and vegetarians can enjoy a bowl of vegetable broth (see recipe)
• A cold bottle of Sprite lemonade soda to keep your sugar up
• A glass of water for more hydration

DINNER (5 pm – 12 am)

• Tea with honey (no milk – read why here)
• A dessert of hazelnut and black espresso jello (see recipe)
• Another glass of water before bed

Tips to Ensure Optimal Bowel Cleansing

• Follow the instructions given to you by your medical team very closely. Partial or no compliance with outlined instructions can be the difference between a successful and unsuccessful colonoscopy.
• Always have a bathroom nearby. Because every meal taken the day before your colonoscopy is liquid, you will pee a lot. Having a bathroom nearby helps to cushion the possible discomfort and frustration of frequent urination.
• Keep your meals fresh and exciting. Keep your clear soups warm and your soft drinks chilled as much as possible.
• Enjoy varieties. A clear liquid diet is already restrictive; do not restrict yourself to just a handful of foods. Try to keep your food options exciting.

Conclusion

In conclusion, when deciding what to eat a day before a colonoscopy, it is critical to stick to the required diet. The required diet – a clear liquid diet – focuses on proper nutrition and hydration to ensure effective bowel cleansing. By following this meal plan and adhering to your doctor’s instructions, you can feel confident that you are well-prepared for the procedure, leading to accurate results and optimal health outcomes.