--- title: "What Is the Specific Carbohydrate Diet (SCD)? When to Consider It and Is Too Restrictive?" entity: "blog" canonical_url: "https://www.drdanwool.com/blog/specific-carbohydrate-diet-scd" markdown_url: "https://www.drdanwool.com/llms/blog/specific-carbohydrate-diet-scd" lastmod: "2026-08-26T15:19:04.213Z" --- Medically reviewed by [Dr. Dan Wool, NMD](https://www.linkedin.com/in/drdanwool/) Arizona-licensed Naturopathic Physician and Gastroenterology Specialist Updated: September 1, 2026 - The Specific Carbohydrate Diet (SCD) eliminates all grains, most dairy, refined sugars, and complex carbohydrates that feed harmful gut bacteria and perpetuate intestinal inflammation. - Clinical surveys and studies show 33 to 42% of IBD patients report remission on the SCD within 2 to 12 months, with improvements in both symptoms and inflammatory lab markers. - The SCD was originally developed to treat celiac disease and IBD in the 1920s; it works by reducing fermentable carbohydrate load, shifting gut microbiota, and improving mucosal integrity. - The diet is demanding and restrictive, requiring careful nutritional planning to avoid deficiencies; it is best undertaken with professional guidance and is not appropriate for everyone. Jake (not his real name) is a 27-year-old graduate student who was diagnosed with [Crohn's disease](/crohns-disease-treatment) at 19. After 8 years on biological medication that had partially controlled his symptoms but never achieved remission, his gastroenterologist mentioned in passing that some patients found dietary changes helpful. Jake dove into the research and found the Specific Carbohydrate Diet. He spent two months learning the protocol, made the transition gradually with help from a registered dietitian, and within four months his calprotectin levels had dropped significantly and his gastroenterologist reduced his medication dose. His case is not unique, and the number of [IBD](/ulcerative-colitis-treatment) patients turning to the SCD as a primary or adjunct therapy continues to grow. ## What Is the Specific Carbohydrate Diet? The Specific Carbohydrate Diet (commonly abbreviated as SCD) is a grain-free, complex-carbohydrate-restricted dietary protocol based on the premise that certain carbohydrates, specifically disaccharides and polysaccharides, are incompletely digested and absorbed in the damaged small intestine, where they become substrate for pathogenic bacteria. The resulting overgrowth, fermentation, and mucosal damage perpetuate a self-reinforcing cycle of intestinal inflammation that the SCD is designed to break.[1] The diet was originally developed in the 1920s by Dr. Sidney Haas, a pediatric gastroenterologist who used it to treat children with [celiac disease](/celiac-disease-treatment) before the gluten connection was understood. It was largely forgotten until 1994, when author Elaine Gottschall published Breaking the Vicious Cycle: Intestinal Health Through Diet, based on her experience using the SCD to treat her daughter's severe [ulcerative colitis.](/ulcerative-colitis-treatment) The book introduced the diet to a large patient audience and ultimately sparked clinical research interest.[2] The SCD allows: all fresh or frozen meats, poultry, fish, and eggs; most fresh and frozen non-starchy vegetables; most fresh and frozen fruits; nuts and nut butters; natural cheeses; homemade yogurt fermented for a minimum of 24 hours (which eliminates virtually all lactose); oils; honey as the only sweetener; and dried legumes that have been properly soaked and cooked. The SCD eliminates: all grains including wheat, rice, oats, corn, and barley; all processed and refined sugars except honey; all starchy vegetables including potatoes and yams; canned vegetables and fruits with added sugars; most dairy except specific hard cheeses and 24-hour fermented yogurt; and all processed, preserved, or packaged foods containing grain-derived ingredients or complex carbohydrate additives.[2] ## What Is the Underlying Theory of the SCD? The SCD's core theory holds that when the intestinal mucosa is damaged, as in IBD, celiac disease, or [SIBO](/blog/siboguide), the brush border enzymes responsible for cleaving disaccharides and processing polysaccharides are reduced or absent. Incompletely digested carbohydrates accumulate in the gut lumen, providing a preferential food source for pathogenic bacteria and yeast. Their fermentation produces gases and organic acids that further damage the mucosa, reduce enzyme production, and perpetuate dysbiosis. By providing only monosaccharides, which require no enzymatic processing for absorption, the SCD removes this irritating substrate while allowing the mucosa to heal.[1] ## Potential Benefits of the Specific Carbohydrate Diet The SCD has documented patient-perceived and clinically observed benefits in inflammatory bowel disease. A 2016 survey of 417 IBD patients who had used the SCD found that 4% reported clinical remission before the diet, 33% reported remission at 2 months, and 42% reported remission at both 6 and 12 months. Among those who achieved remission, 47% reported improvement in abnormal laboratory values.[3] Beyond symptom relief, the SCD shifts gut microbiota composition in ways consistent with reduced intestinal inflammation. A small clinical trial in pediatric Crohn's disease found that all participants who completed 12 weeks on the SCD achieved clinical remission, with C-reactive protein (an inflammatory marker) declining across all dietary groups tested.[4] The SCD also has appeal as a non-pharmaceutical intervention that patients can control independently, as an adjunct to existing IBD medications, and as a starting point for gut microbiome rehabilitation in conditions beyond IBD including SIBO and [IBS](/blog/ibs-d-guide). ## Important Considerations for the Specific Carbohydrate Diet - The SCD is demanding. A study of 50 long-term SCD users found that the average person spent nearly 11 hours per week preparing food. Dining out and social eating require significant planning and accommodation. The level of commitment required to follow the SCD strictly is among the highest of any therapeutic diet, and partial adherence reduces its effectiveness substantially.[2] - Nutritional risk is real . Studies have found that SCD followers, particularly children, may not receive adequate amounts of folate, thiamine, vitamin B6, calcium, and vitamin D without careful supplementation and dietary planning. Professional supervision by a registered dietitian experienced with the SCD is strongly recommended.[2] - The SCD is not designed for weight loss and is not a low-carbohydrate or ketogenic diet. It allows unlimited fruit, honey, and natural sugars. People with diabetes or blood sugar dysregulation must account for this when considering the protocol. - The SCD is not the right choice for everyone with gut disease. It is best suited to motivated patients with IBD, celiac disease (in addition to strict gluten-free diet), or SIBO who are willing to commit to long-term dietary change. It is less appropriate as a short-term symptom management tool. ## What Research Says About the SCD A 2020 randomized dietary controlled trial published in PMC examining three versions of the SCD in pediatric Crohn's disease found that all three dietary groups, including a standard SCD, a modified SCD incorporating oats and rice, and a whole-foods version, produced clinical remission in all participants who completed the protocol, with reductions in C-reactive protein across groups.[4] This suggests that the specific food restrictions of the classic SCD may not all be equally necessary and that modified versions may offer more flexibility without sacrificing efficacy. Broader dietary reviews published in PMC have consistently placed the SCD among the most studied therapeutic diets for IBD, alongside the Crohn's Disease Exclusion Diet (CDED), noting that while evidence is promising, most studies have been small and retrospective. The consensus is that the SCD is likely beneficial for a subset of patients and warrants further rigorous clinical trial evaluation before becoming a standard recommendation.[1] For [SIBO](/blog/siboguide) specifically, the SCD is used to reduce the fermentable carbohydrate load available to small intestinal bacteria, functioning similarly to the low-FODMAP diet but with different food categories and a stronger anti-inflammatory theoretical framework. The overlap between the SCD's allowed foods and low-fermentation SIBO dietary protocols makes it a reasonable choice in some SIBO presentations. ## What to Expect on the Specific Carbohydrate Diet - Weeks 1-4: The first few weeks of the SCD are typically the most challenging as the gut adjusts to the absence of complex carbohydrates. Some patients experience temporary worsening of symptoms during this adaptation period, particularly if dysbiosis-driven fermentation slows before the beneficial shifts in microbiota are established. - Weeks 4-12: most patients who will respond begin to notice improvement in stool consistency, reduction in bloating and cramping, and gradually improving energy. Laboratory markers of inflammation such as CRP and fecal calprotectin typically take longer to normalize, often three to six months. - 12+ Weeks: Long-term SCD users consistently report that the diet becomes easier to maintain after the first three to six months as new food preparation habits are established and food options become more familiar. ## Natural Alternatives and Related Approaches Patients who find the classic SCD too restrictive have several related options. - The modified SCD tested in the pediatric Crohn's trial above includes rice and oats and appears to produce comparable outcomes for some patients. - The Crohn's Disease Exclusion Diet (CDED) is a more structured protocol with similar principles but more flexibility and growing clinical evidence. - The [low-FODMAP diet](/blog/low-fodmap-diet) shares some SCD principles and is better validated for IBS. - The Mediterranean diet is less restrictive, has strong anti-inflammatory properties, and is increasingly studied for IBD maintenance. ## The Bottom Line on the Specific Carbohydrate Diet The SCD is a legitimate, evidence-informed dietary intervention with a meaningful clinical track record in IBD, particularly [Crohn's disease](/crohns-disease-treatment) and [ulcerative colitis](/ulcerative-colitis-treatment). It is genuinely demanding and not appropriate as a casual dietary experiment. But for motivated patients with refractory gut disease who are seeking alternatives or adjuncts to pharmaceutical management, the SCD offers a structured, biologically plausible, and clinically supported pathway. The key is entering it with professional guidance, nutritional monitoring, and realistic expectations about the commitment required. ## Frequently Asked Questions about Specific Carbohydrate Diet (SCD) ### What foods are not allowed on the Specific Carbohydrate Diet? Quick Answer: The SCD eliminates all grains, most dairy, refined sugars (except honey), starchy vegetables, canned goods with additives, and all processed foods containing complex carbohydrates. Full Answer: The SCD's restrictions are extensive. All grains are excluded, including wheat, rice, corn, oats, rye, and barley. Most dairy is excluded except hard natural cheeses and homemade yogurt fermented for 24 hours. All refined sugars, sweeteners, and sugar alcohols are excluded except honey. Starchy vegetables including potatoes, sweet potatoes, and parsnips are excluded. Canned vegetables and fruits with added sugars or preservatives are not allowed. All processed, packaged, and preserved foods are excluded. These restrictions are designed to eliminate all complex carbohydrate sources that can feed pathogenic gut bacteria. ### Is the Specific Carbohydrate Diet the same as gluten-free? Quick Answer: No. The SCD is grain-free, which includes gluten-containing grains, but it also eliminates many gluten-free grains such as rice, corn, and oats that a standard gluten-free diet allows. Full Answer: The SCD eliminates all grains, while a standard gluten-free diet only eliminates gluten-containing grains (wheat, barley, rye) and allows rice, corn, quinoa, oats, and other gluten-free alternatives. For people with [celiac disease](/celiac-disease-treatment), the SCD can be used alongside a gluten-free diet but goes further in restricting the carbohydrate substrate available to gut bacteria. This distinction matters practically: a person with celiac who follows a standard gluten-free diet and continues to have gut symptoms may find the additional restrictions of the SCD beneficial. ### How long does it take for the Specific Carbohydrate Diet to work? Quick Answer: Most patients who respond begin to notice symptom improvement within 4 to 8 weeks, with laboratory marker improvements and more stable remission typically taking 3 to 6 months. Full Answer: The survey of 417 IBD patients on the SCD found that 33% reported remission at 2 months and 42% at 6 and 12 months. Some individuals see rapid improvement within two weeks, while others require three to four months before meaningful change is evident. Laboratory markers of inflammation such as CRP and fecal calprotectin tend to lag clinical symptoms and may not normalize until three to six months on the diet. Strict adherence and professional dietary guidance significantly improve outcomes. ### Can I follow the SCD if I also have SIBO? Quick Answer: Yes. The SCD is often used as a dietary component of [SIBO](/sibo) management because it reduces the fermentable carbohydrate load available to small intestinal bacteria. Full Answer: The SCD's elimination of complex carbohydrates directly reduces the substrate for bacterial fermentation in the small intestine, aligning with the goals of SIBO dietary management. However, some SCD-allowed foods including fruits, honey, and legumes contain fermentable sugars that can aggravate SIBO symptoms. In SIBO, the SCD is often further modified or combined with elements of the [low-FODMAP diet](/blog/low-fodmap-diet) to reduce the fermentation burden more comprehensively. The appropriate dietary protocol for concurrent SIBO and IBD should be individualized with practitioner guidance. ### Is the SCD nutritionally complete? Quick Answer : With careful planning it can be, but studies have found deficiencies in folate, thiamine, B6, calcium, and vitamin D in people following the SCD without supplementation. Full Answer : The SCD's elimination of grains, most dairy, and processed foods removes common dietary sources of several key micronutrients. Studies including one examining nine children on the SCD for IBD found inadequate [vitamin D](/blog/vitamin-d) and calcium intake. Adults following the SCD should work with a dietitian to ensure adequate protein, caloric intake, and micronutrient sufficiency, and should monitor relevant lab values including vitamin D, calcium, B12, folate, and iron periodically. Targeted supplementation is typically needed for long-term SCD adherence. ## Are You Ready to Fix Your Gut? Struggling with your gut health? [Dr. Dan Wool](/about) offers personalized, natural solutions at his Scottsdale naturopathic practice. [Book a free 15 minute discovery call](/booking) today and take the first step toward lasting digestive relief. Disclaimer: The information provided on this page is for educational purposes only and is not intended as medical advice, diagnosis, or treatment. Dr. Dan Wool nor his affiliates do not make claims about the effectiveness of supplements, peptides, hormones or other therapies outside of the contexts supported by cited clinical evidence and regulatory approval. Always consult a qualified healthcare provider before starting, changing, or stopping any medical or wellness program. About the Author ## Dr. Dan Wool, NMD [Dr. Dan Wool](/about) is a naturopathic doctor who specializes in gastroenterology, hormones and men's health in Scottsdale, Arizona. [Set up a free 15-minute discovery call with Dr. Wool today! ](https://drdanwool.com/booking) [Read more about Dr. Wool's Gut Health Journey](/about) ## References: 1. [Olendzki B, et al. Diet as a therapeutic option for adult inflammatory bowel disease. PMC. 2017. https://pmc.ncbi.nlm.nih.gov/articles/PMC5821251/](https://pmc.ncbi.nlm.nih.gov/articles/PMC5821251/) 2.[WebMD. Specific Carbohydrate Diet (SCD Diet) - Crohn's Disease. 2024. https://www.webmd.com/ibd-crohns-disease/crohns-disease/specific-carbohydrate-diet-overview](https://www.webmd.com/ibd-crohns-disease/crohns-disease/specific-carbohydrate-diet-overview) 3. [Cohen SA, et al. Patients Perceive Clinical Benefit with the Specific Carbohydrate Diet for Inflammatory Bowel Disease. Dig Dis Sci. 2016. https://pubmed.ncbi.nlm.nih.gov/27638834/](https://pubmed.ncbi.nlm.nih.gov/27638834/) 4.[Suskind DL, et al. The Specific Carbohydrate Diet and Diet Modification as Induction Therapy for Pediatric Crohn's Disease. Nutrients. 2020. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7762109/](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7762109/) 5. [Brown SC, et al. Current Nutritional Therapies in Inflammatory Bowel Disease. Nutrients. 2023. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9920576/](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9920576/)