There’s minimal research to support the use of the low-fiber/low-residue diet outside of some specific instances like colonoscopy preparation.
While there is no standard list of accepted or prohibited foods, the low-fiber/low-residue diet restricts fiber (whole grains, beans, vegetables) and other foods (milk) that stimulate bowel activity.
The low-fiber/low-residue diet doesn’t address the underlying causes of disease like food sensitivities, dysbiosis, and/or leaky gut.
A low-fiber/low-residue diet still allows foods like refined grains and sugars known to cause gut inflammation and gut microbiome imbalances.
There are better, more research-backed diet options for rebuilding the gut such as the Paleo, low FODMAP, autoimmune protocol, and elemental diets.
In my experience, diet is unquestionably the most impactful intervention for improving your gut and overall health. That being said, there are certain diets with very little research that tend to be recommended for digestive symptoms that just don’t make much of an impact. The low-fiber/low-residue diet seems to fit into this category.
Like many popular diet trends, the low-fiber/low-residue diet has a couple of principles such as restricting dairy and fiber that can be quite helpful. But, the diet on the whole doesn’t necessarily translate into clinical benefit and appears to provide hardly any advantages for healing your gut.
A low-fiber/low-residue diet restricts fiber (from whole grains, beans, and vegetables) and other foods (like milk) that can stimulate your bowels. The hope is that by restricting these foods, the size and number of bowel movements will be reduced, which will decrease painful symptoms like diarrhea, bloating, gas, and abdominal pain.
Although this diet is still being recommended for a variety of gastrointestinal conditions, there’s not enough evidence to support its use outside of some very specific situations like bowel preparation (prior to a colonoscopy or certain surgeries), abdominal adhesions, and gastroparesis . In addition, this diet does not seem to reduce inflammation or target the underlying cause of GI symptoms .
However, there are plenty of effective dietary options that can treat your gut and give you symptom relief. In this article, we’ll break down the low-fiber/low-residue diet, including what the research says about its use. We’ll also discuss why you’ll likely get more benefit from following a more research-backed diet option like the Paleo or low FODMAP diet.
Low-Fiber Low-Residue Diet Basics
It’s important to note that there’s no clinical definition or official list of approved foods for either the low-fiber or low-residue diet, and they’re often referred to interchangeably . However, there are a few differences between the two. Before discussing the basics of each type of diet, let’s review the definitions of residue and fiber.
Residue refers to indigestible food or substances (such as dietary fiber, bacteria, and gastric secretions) that remain in the GI tract and contribute to the bulk of your stool [1, 2, 3].
Fiber refers to nondigestible carbohydrates and lignins (components of plant cell walls). Fiber can be non-fermentable (insoluble) or fermentable (soluble) by the bacteria in your colon, and both types can increase the size and weight of your stool .
What is a Low-Fiber Diet?
The current Dietary Guidelines for Americans recommendation is 14 grams of fiber for every 1,000 calories consumed for healthy people . While there’s no clear definition, a low-fiber diet is generally assumed to be one with less than 10 grams of total daily fiber — which is less than half the daily recommendation for the average person [1, 3].
A low-fiber diet restricts high-fiber foods like:
Beans and legumes
Raw fruits and vegetables
The goal of the low-fiber diet is to reduce the size of your stool and the number of bowel movements you have. However, simply cutting out fiber doesn’t address the root cause of digestive symptoms related to an imbalanced gut microbiome and/or inflammation.
Refined grains and sugars, which are allowed on this type of diet, can fuel inflammation and feed problematic bacteria leading to and exacerbating a variety of GI symptoms [5, 6, 7, 8].
What is a Low-Residue Diet?
A low-residue diet is a type of low-fiber diet that also restricts milk products. Milk is a low-fiber food but can increase residue in the colon and bulk the stool [1, 2]. The low residue diet restricts dietary fiber to less than 10 to 15 grams per day as well as other foods that can stimulate your bowels.
Just like with the low-fiber diet, the goal is to reduce stool size and bowel movements frequency to hypothetically improve painful GI symptoms [2, 9].
The low-residue diet has been recommended for a variety of digestive disorders since the early 1900’s and may still be recommended for [2, 9]:
Recovery from bowel surgery (ileostomy, colostomy, bowel resection)
Colonoscopy (a screening to examine the health of the large intestine)
Symptom reduction from abdominal pain, cramping, and/or diarrhea
Active flare-ups of Crohn’s disease or diverticular disease (infection in pouches formed in the colon)
It’s important to note that one 2015 literature review concluded: “there is insufficient evidence to further justify the clinical use of a low residue diet .” And the Academy of Nutrition and Dietetics officially removed the low-residue diet from the Nutrition Care Manual because there’s no scientifically accepted definition of residue or low residue, and there’s a lack of research into the effects of the low-residue diet .
Having said that, there’s not a lot of research to discredit the low-residue diet either. And there are a couple of principles of this diet like dairy and fiber restriction, that can be helpful for improving GI symptoms.
What Foods are Included on a Low-Residue Diet?
There’s no specific food list for a low-residue diet likely because :
It’s hard to predict the exact amount of residue produced by different foods.
All foods can lead to some degree of residue within the intestine.
The gut microbiome and bowel function of each person are variable.
The above points highlight why defining the low-residue diet can be so problematic, but there are still generally accepted foods. Here’s a list of some foods that may be included on a low-residue diet [9, 10, 11]:
Well-cooked lean meat (like seafood and poultry)
Hard boiled eggs
Limited amounts of fruit juice, tea, and coffee
Vegetable juices (without pulp)
Refined carbohydrates (plain bagels, white English muffins, white bread, plain crackers, white toast)
Dairy products (limited to two cups per day, if tolerated)
Raw, canned, or cooked fruits without the skins (apricots, bananas, cantaloupe, honeydew, watermelon, nectarines, papaya, peaches, plums, applesauce, and avocado)
Plain cakes, cookies, and puddings
Some of the foods on this list, like sugar and processed grains, are technically low residue but they offer no health benefits. Even worse, they can cause gut microbiome imbalances and inflammation leading to GI symptoms. Not to mention, the amount of allowed dairy is considerably high for a “low-dairy” diet, which undermines the premise of this diet.
What Foods are Avoided on a Low-Residue Diet?
The following chart lists the foods that are often restricted on a low-residue diet but again, there’s no universally agreed upon list [10, 11, 12]:
Now that you have a general understanding of how the low-fiber/low-residue diet works, let’s look at some of the research.
Clinical Uses of the Low-Residue Diet
While there’s not enough research or clinical evidence to support the use of the low-residue diet for common gut symptoms or conditions like IBS and inflammatory bowel disease (IBD) , it can be useful in a few specific situations [3, 13, 14, 15, 16, 17]:
Bowel preparation prior to a colonoscopy
In preparation for and following bowel or gynecological surgery
Abdominal adhesions (a type of internal scar tissue)
Gastroparesis (a disorder where food doesn’t move through the stomach to the small intestine properly)
Low-Residue Diet for Bowel Preparation
Typical preparation for colon screening or surgery involves the use of a clear liquid diet and laxatives to clean the colon. The low residue diet has been found to be as effective as or better than a liquid diet for improving bowel cleanliness prior to a colonoscopy or other bowel procedure . Patients who are allowed to consume a low-residue diet instead of a clear liquid diet for colon prep tolerate it better and are more willing to repeat the process in the future .
In addition, a 2021 systematic review and meta-analysis found that patients following a low-residue diet for bowel prep had fewer symptoms like nausea, hunger, and vomiting when compared to those on a liquid diet .
Other Uses of the Low-Residue Diet
Outside of colonoscopy prep, the usefulness of the low-residue diet seems to be limited. Here’s a breakdown of the current research:
One 2014 randomized controlled trial found the low-residue diet was associated with less nausea, faster return of bowel function, and significantly shorter length of hospital stay after colorectal surgery when compared to a clear liquid diet .
One 2022 randomized controlled trial found that women who consumed a low-residue diet three days before gynecological surgery had better bowel prep prior to surgery, shorter time in surgery, and a quicker return to normal bowel function after surgery when compared to those who consumed a regular diet .
A 2022 literature review found the low-residue diet to reduce symptoms of gastroparesis .
Where The Low-Residue Diet Falls Short
When it comes to general GI symptoms and disorders like IBS and IBD, the low-residue diet doesn’t have any meaningful research to support its use. It doesn’t decrease inflammation or address the underlying cause of digestive conditions, and prolonged use of this diet may lead to nutritional deficiencies and can worsen symptoms like constipation .
In addition, one randomized controlled trial found patients with active Crohn’s disease (a form of IBD) who were following a low-residue diet had no difference in their symptoms after they reintroduced fiber . However, the role fiber plays in IBD is unclear, as some people with Crohn’s disease may have difficulty digesting certain types of fiber. When in doubt, listen to your body.
Lastly, the low-residue diet includes foods that can trigger inflammation and cause metabolic changes like sugar and processed foods. It also allows a fairly high amount of dairy (2 cups), despite being a low-dairy diet, which is known to cause digestive symptoms in many people.
Fortunately, there are several dietary options that include some aspects of the low-residue diet (like dairy and fiber restriction), are supported by research, and can treat the underlying cause of painful GI symptoms.
Diet Options for Improving Digestive Symptoms
If you’re struggling with digestive symptoms, it’s important to think about the fuel you’re providing your gut. A brief gut reset followed by a healthy gut-healing diet can help to calm down your symptoms and allow your gut to heal more completely.
While the low-residue diet is probably not the best diet option, there are a couple of principles of the diet that are helpful:
Dairy is a major food allergen but also contains lactose (a sugar that’s difficult for some people to digest). Restricting dairy (as is done on the Paleo and low FODMAP diets) can be a good way to calm inflammation and create a healthy environment for your gut bacteria.
Dietary fiber can be problematic for some people with constipation and IBS symptoms, and low-fiber diets have been found to be beneficial for those with IBD, diverticulitis, bowel obstructions, and infectious GI diseases . Restricting fiber for a time (as is done with the Low FODMAP diet) can reduce the fuel for problematic bacteria and help to reduce inflammation.
Let’s review some preferred dietary options:
A short gut reset (24 to 48 hours) with an elemental diet like Elemental Heal may be helpful to calm inflammation and reduce the burden on your gut. The elemental diet is a liquid meal replacement that’s very easily absorbed in the digestive tract and supplies all macronutrients and essential vitamins.
The formula (hypoallergenic, anti-bacterial, and anti-inflammatory) is sold as a powder that you simply mix, blend, or shake up with water and sip on throughout the day.
Elemental diets have been found to improve small intestinal bacterial overgrowth and GI symptoms in IBS patients  and to reduce symptoms, maintain remission, and prevent relapse in those with Crohn’s disease .
If you complete a short gut reset, consider implementing it alongside a healthy, gut-healing diet plan to help maintain your results in the long run. If you’re new to making diet-related changes, I recommend starting with the Paleo diet.
A Paleo diet can calm inflammation by reducing your exposure to foods that provoke an immune and inflammatory response [7, 8]. This diet removes:
On the Paleo diet, you’ll eat the following foods for a few weeks:
Fresh fruits (in moderation)
Grass-fed, lean meats
Fresh fish and eggs
Healthy fats, like olive oil, coconut oil, avocado oil and avocados
Nuts and seeds
If your symptoms significantly improve on the Paleo meal plan then stick with it and begin to reintroduce the healthy foods you’ve eliminated one at a time. If you’re not entirely happy with your results though, you may want to move to the low FODMAP diet.
Low FODMAP Diet
The low FODMAP diet is more restrictive than Paleo and targets possible underlying gut imbalances that could be causing inflammation. This type of diet starves overgrown or pathogenic bacteria and has been shown to improve IBS, IBD, and other functional GI disorders [6, 16, 18, 20, 21]. One literature review found the low FODMAP diet to be a first-line therapy for IBS and reports it’s preferable to the low-residue diet .
Here’s an overview of the low FODMAP diet:
If you’ve gone through the Paleo and low FODMAP plans but feel there’s still room for improvement, you may want to check out the autoimmune protocol diet, which is the most restrictive option of the three.
Autoimmune Protocol Diet
The autoimmune protocol diet (AIP) is a stricter version of Paleo eating that eliminates a wider variety of foods linked with triggering inflammation in those with autoimmunity. Because it’s so restrictive, the AIP diet shouldn’t be considered an initial treatment option. But if you’ve worked your way through the other meal plans and still have symptoms, this diet is one option that has been shown to help reduce IBD symptoms .
Here’s a chart of foods to include and foods to avoid on this type of diet:
The Paleo, low FODMAP, and autoimmune protocol meal plans have some great research and clinical evidence to support their use in healing a variety of GI complaints. You’ll likely experience much symptom relief rather quickly.
But if you feel your gut needs more support, you can come back to the elemental gut reset at any point while you’re changing up your diet. Starting with one to two days is great but Elemental Heal can also be used for longer periods of time as a hard-hitting treatment.
There’s no clear definition of a low-fiber/low-residue diet, and there’s really no research to support its use outside of some very specific instances like colonoscopy prep.
However, there are a couple of principles of the low-fiber/low-residue diet, like dairy and fiber restriction, that can be helpful. Healing your GI symptoms can best be accomplished by working your way through a short gut reset (with Elemental Heal) and moving toward a healthy, gut-healing meal plan like the Paleo or low FODMAP diet.
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Vanhauwaert E, Matthys C, Verdonck L, De Preter V. Low-residue and low-fiber diets in gastrointestinal disease management. Adv Nutr. 2015 Nov 13;6(6):820–7. DOI: 10.3945/an.115.009688. PMID: 26567203. PMCID: PMC4642427.
Pimentel M, Constantino T, Kong Y, Bajwa M, Rezaei A, Park S. A 14-day elemental diet is highly effective in normalizing the lactulose breath test. Dig Dis Sci. 2004 Jan;49(1):73–7. DOI: 10.1023/b:ddas.0000011605.43979.e1. PMID: 14992438.
Zhan Y, Zhan Y-A, Dai S-X. Is a low FODMAP diet beneficial for patients with inflammatory bowel disease? A meta-analysis and systematic review. Clin Nutr. 2018 Feb;37(1):123–9. DOI: 10.1016/j.clnu.2017.05.019. PMID: 28587774.
Whalen KA, McCullough ML, Flanders WD, Hartman TJ, Judd S, Bostick RM. Paleolithic and Mediterranean Diet Pattern Scores Are Inversely Associated with Biomarkers of Inflammation and Oxidative Balance in Adults. J Nutr. 2016 Jun;146(6):1217–26. DOI: 10.3945/jn.115.224048. PMID: 27099230. PMCID: PMC4877627.
Olendzki BC, Silverstein TD, Persuitte GM, Ma Y, Baldwin KR, Cave D. An anti-inflammatory diet as treatment for inflammatory bowel disease: a case series report. Nutr J. 2014 Jan 16;13:5. DOI: 10.1186/1475-2891-13-5. PMID: 24428901. PMCID: PMC3896778.
Tarleton S, DiBaise JK. Low-residue diet in diverticular disease: putting an end to a myth. Nutr Clin Pract. 2011 Apr;26(2):137–42. DOI: 10.1177/0884533611399774. PMID: 21447765.
Eswaran S, Muir J, Chey WD. Fiber and functional gastrointestinal disorders. Am J Gastroenterol. 2013 May;108(5):718–27. DOI: 10.1038/ajg.2013.63. PMID: 23545709.
Lau C, Phillips E, Bresee C, Fleshner P. Early use of low residue diet is superior to clear liquid diet after elective colorectal surgery: a randomized controlled trial. Ann Surg. 2014 Oct;260(4):641–7; discussion 647. DOI: 10.1097/SLA.0000000000000929. PMID: 25203881.
Wu R, Ji W-Y, Yang C, Zhan Q. A Systematic Review and Meta-Analysis of Low-Residue Diet Versus Clear Liquid Diet: Which Is Better for Bowel Preparation Before Colonoscopy? Gastroenterol Nurs. 2021 Oct 1;44(5):341–52. DOI: 10.1097/SGA.0000000000000554. PMID: 34238885. PMCID: PMC8478318.
Palaia I, Di Donato V, Caruso G, Vestri A, Scudo M, Alunni Fegatelli D, et al. Preoperative low-residue diet in gynecological surgery. Eur J Obstet Gynecol Reprod Biol. 2022 Apr;271:172–6. DOI: 10.1016/j.ejogrb.2022.02.018. PMID: 35219167.
Tack J, Tornblom H, Tan V, Carbone F. Evidence-Based and Emerging Dietary Approaches to Upper Disorders of Gut-Brain Interaction. Am J Gastroenterol. 2022 Jun 1;117(6):965–72. DOI: 10.14309/ajg.0000000000001780. PMID: 35417429. PMCID: PMC9169754.
Tabibian N, Swehli E, Boyd A, Umbreen A, Tabibian JH. Abdominal adhesions: A practical review of an often overlooked entity. Ann Med Surg (Lond). 2017 Mar;15:9–13. DOI: 10.1016/j.amsu.2017.01.021. PMID: 28203370. PMCID: PMC5295619.
Charlebois A, Rosenfeld G, Bressler B. The impact of dietary interventions on the symptoms of inflammatory bowel disease: A systematic review. Crit Rev Food Sci Nutr. 2016 Jun 10;56(8):1370–8. DOI: 10.1080/10408398.2012.760515. PMID: 25569442.
Tsertsvadze A, Gurung T, Court R, Clarke A, Sutcliffe P. Clinical effectiveness and cost-effectiveness of elemental nutrition for the maintenance of remission in Crohn’s disease: a systematic review and meta-analysis. Health Technol Assess. 2015 Mar;19(26):1–138. DOI: 10.3310/hta19260. PMID: 25831484. PMCID: PMC4781042.
Marsh A, Eslick EM, Eslick GD. Does a diet low in FODMAPs reduce symptoms associated with functional gastrointestinal disorders? A comprehensive systematic review and meta-analysis. Eur J Nutr. 2016 Apr;55(3):897–906. DOI: 10.1007/s00394-015-0922-1. PMID: 25982757.
Altobelli E, Del Negro V, Angeletti PM, Latella G. Low-FODMAP Diet Improves Irritable Bowel Syndrome Symptoms: A Meta-Analysis. Nutrients. 2017 Aug 26;9(9). DOI: 10.3390/nu9090940. PMID: 28846594. PMCID: PMC5622700.
Konijeti GG, Kim N, Lewis JD, Groven S, Chandrasekaran A, Grandhe S, et al. Efficacy of the autoimmune protocol diet for inflammatory bowel disease. Inflamm Bowel Dis. 2017 Nov;23(11):2054–60. DOI: 10.1097/MIB.0000000000001221. PMID: 28858071. PMCID: PMC5647120.
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