"Keto Cured My IBS": Why Portland's Gut Guru Lied

By Franklin Everett Shaw

May 5, 2026

Let’s talk about your gut. Specifically, let’s dissect the claims swirling around Portland, Oregon, regarding the ketogenic diet as a magic bullet for Irritable Bowel Syndrome (IBS). A local “gut guru” might be singing its praises, but before you ditch the Stumptown coffee and dive headfirst into bacon and avocados, let’s pump the brakes and examine the science.

IBS is a beast of a condition, a functional gastrointestinal disorder characterized by abdominal pain, bloating, gas, diarrhea, and/or constipation. It’s a diagnosis of exclusion, meaning doctors rule out other conditions before landing on IBS. There are different subtypes: IBS-D (diarrhea-predominant), IBS-C (constipation-predominant), and IBS-M (mixed).

The ketogenic diet, for those unfamiliar, is a very low-carbohydrate, high-fat diet that forces the body to burn fat for fuel instead of glucose. This metabolic state, called ketosis, can have various effects on the body, some beneficial, some not so much.

So, can keto cure your IBS in Portland? The short answer is: probably not, and it might even make things worse.

Let’s address the claims made by our hypothetical Portland “gut guru.” They likely tout the anti-inflammatory effects of keto and its potential to reduce gut bacteria overgrowth. While there’s some truth to these points, the devil is in the details.

First, inflammation. Keto can reduce inflammation in some individuals. However, the gut microbiome is incredibly complex. Drastically altering your diet can disrupt the delicate balance of bacteria, potentially leading to dysbiosis – an imbalance that can worsen IBS symptoms.

Second, bacterial overgrowth. Small intestinal bacterial overgrowth (SIBO) is sometimes associated with IBS. Keto might help reduce certain types of bacteria, but it can also promote the growth of others, particularly those that thrive on fat. This is a gamble, not a guaranteed solution.

Here’s where the Portland context becomes crucial. Portlanders are known for their love of craft beer, kombucha, and sourdough bread – all high in fermentable carbohydrates. These foods can exacerbate IBS symptoms in some individuals. Simply cutting these out, regardless of keto, might provide some relief.

However, keto eliminates all grains, legumes, most fruits, and many vegetables. This severely restricts fiber intake. Fiber is crucial for gut health, acting as food for beneficial bacteria and helping regulate bowel movements. For someone with IBS-C, drastically reducing fiber could be disastrous.

Consider this scenario: A Portland resident with IBS-C, let’s call her Sarah, reads about keto and decides to give it a try. She cuts out her usual oatmeal and whole-wheat toast, replacing them with bacon and eggs. Initially, she might feel better due to the elimination of gluten and other potential triggers. However, within a week, she’s experiencing severe constipation, bloating, and abdominal pain, far worse than before. This is because she’s deprived her gut of the fiber it needs to function properly.

Now, let’s consider someone with IBS-D, let’s call him David. He might find some initial relief on keto. The reduced carbohydrate intake can decrease the amount of fermentable material in his gut, leading to less gas and diarrhea. However, the high fat content of keto can also stimulate bile production, which can have a laxative effect in some individuals, potentially negating any benefits.

Furthermore, the long-term effects of keto on the gut microbiome are still largely unknown. We don’t know how it affects the diversity and stability of the gut ecosystem over time.

So, what’s the alternative? Instead of blindly following the advice of a “gut guru,” consult with a board-certified gastroenterologist in Portland. They can perform diagnostic tests to rule out other conditions and develop a personalized treatment plan based on your specific IBS subtype and triggers.

Many gastroenterologists in the Portland area recommend a low-FODMAP diet for IBS. FODMAPs (Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols) are types of carbohydrates that are poorly absorbed in the small intestine and fermented by bacteria in the colon, leading to gas, bloating, and diarrhea.

A low-FODMAP diet involves temporarily restricting high-FODMAP foods like onions, garlic, apples, pears, and dairy products, then gradually reintroducing them to identify individual triggers. This approach is more targeted and less restrictive than keto, allowing for a wider variety of nutrient-rich foods.

Another common recommendation is to increase soluble fiber intake. Soluble fiber, found in foods like oats, psyllium husk, and flaxseeds, absorbs water and forms a gel-like substance in the gut, which can help regulate bowel movements and reduce diarrhea.

Probiotics can also be beneficial for some individuals with IBS. Probiotics are live microorganisms that can help restore the balance of bacteria in the gut. However, not all probiotics are created equal. It’s important to choose a probiotic that contains strains that have been shown to be effective for IBS.

Here’s a crucial point: IBS management is highly individualized. What works for one person might not work for another. There’s no one-size-fits-all solution.

Before jumping on the keto bandwagon, consider these potential pitfalls:

• Nutrient deficiencies: Keto can be restrictive and lead to deficiencies in essential vitamins and minerals.
• The "keto flu": The initial transition to keto can cause flu-like symptoms such as fatigue, headache, and nausea.
• Social limitations: Keto can be difficult to maintain in social situations, especially in a food-centric city like Portland.
• Potential for disordered eating: The restrictive nature of keto can trigger or exacerbate disordered eating patterns.

Instead of chasing a quick fix, focus on building a sustainable, personalized approach to managing your IBS. Work with a gastroenterologist and a registered dietitian to identify your triggers, develop a balanced diet, and manage your symptoms effectively. Don’t let the allure of a trendy diet overshadow the importance of evidence-based medicine and individualized care. Your gut will thank you for it.