Spinach, almonds, and sweet potatoes sit near the top of most healthy-eating lists. New gut research is asking a question that quietly complicates that assumption — at least for some people.
- A 2026 study examined how people with inflammatory bowel disease (IBD) process a natural plant compound called oxalate, found in spinach, almonds, and sweet potatoes.
- Two gut proteins that normally clear oxalate from the body, SLC26A2 and SLC26A3, were found at lower levels in people with IBD.
- Crohn's disease patients had noticeably higher oxalate levels in their stool than healthy volunteers, even though both groups ate similar amounts of plant food.
- In mice, extra dietary oxalate combined with gut inflammation lowered survival by 60 percent compared to inflammation alone.
- Researchers were clear that this does not mean spinach, almonds, or other plant foods are unsafe for the general population.
So does eating spinach and almonds actually worsen gut inflammation? For most people, no. These foods remain some of the most nutrient-dense choices on the plate. But for people living with Crohn's disease or ulcerative colitis, a 2026 study found their guts may not clear oxalate the way a healthy gut does. Oxalate usually passes through the body without any issue. In IBD, however, researchers observed lower activity in the gut proteins responsible for removing it, letting oxalate build up and interact with the immune cells lining the intestine. The problem is not the food itself — it is how an already-inflamed gut handles it, and that distinction points toward better-targeted care rather than blanket food restrictions.
What the New Study Actually Found
Researchers compared gene activity and stool oxalate levels in people with IBD against healthy volunteers, using dietary questionnaires and a DNA-based stool test to confirm both groups were eating similar amounts of plant food. That ruled out diet alone as the explanation for the difference. Two transport proteins, SLC26A2 and SLC26A3, which normally shuttle oxalate out of the gut, were consistently lower in people with IBD. Crohn's disease patients, in particular, showed significantly higher stool oxalate despite no major difference in what they ate. A third protein, SLC26A6, was linked to stricturing Crohn's disease — a more severe, narrowing form of the condition — in nearly 75 percent of affected patients. In mouse experiments, animals given extra oxalate alongside a colitis-inducing substance were 60 percent less likely to survive than those without the added oxalate.
Why an Inflamed Gut Handles Oxalate Differently
Oxalate is not a toxin — it is a natural compound found in many vegetables, nuts, and tubers, and a healthy gut clears it efficiently through dedicated transport proteins. This research suggests that in inflammatory bowel disease, that clearance system does not work the way it should. One researcher involved in the study, Dr. Salvador, put it simply: something is fundamentally different about how these guts handle oxalate. Another, Dr. Sheikh, noted that the findings point to a specific dietary molecule actively contributing to inflammation, rather than just sitting in the background. That is a meaningful shift in how doctors may eventually approach diet and IBD flare-ups — not as a single "good foods versus bad foods" list, but as a question of how an individual gut is functioning.
Should You Stop Eating Spinach, Almonds, or Sweet Potatoes?
For the vast majority of people, the answer is a clear no. The researchers behind this study were careful to say their findings do not justify removing oxalate-rich plant foods from a healthy diet, and that larger, longer studies are needed before any formal dietary guidance changes. Spinach, almonds, and sweet potatoes remain some of the most nutrient-dense foods available — rich in fibre, healthy fats, and micronutrients most people do not get enough of. The findings matter most for one specific group: people already diagnosed with Crohn's disease or ulcerative colitis, especially if they notice symptoms flare after oxalate-rich meals. For them, this research is a reason to talk to a gastroenterologist or dietitian about personalised portions — not a reason for anyone else to fear their vegetables.
What This Means for How We Think About "Healthy" Food
This study is a useful reminder that nutrition science is rarely about a single ingredient being simply good or bad. It is about how a specific body, at a specific time, processes what it eats. We have written before about the bioavailability of nutrients — the idea that what is on your plate matters less than what your body can actually absorb and use. The same logic applies here: a food's nutrient value does not change, but a person's ability to process it safely can. If you are looking for simple, everyday ways to support digestion, our guide on how to improve nutrient absorption naturally at home is a good place to start, whether or not you live with a gut condition like IBD.
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Frequently Asked Questions
1. What is oxalate and why is it getting attention in gut health research?
Oxalate is a natural compound found in many plant foods, including spinach, almonds, and sweet potatoes. A healthy gut clears it easily, but a 2026 study found that people with inflammatory bowel disease may have lower activity in the gut proteins that normally remove oxalate, letting it build up and potentially worsen existing inflammation.
2. Does eating spinach or almonds cause inflammatory bowel disease?
No. There is no evidence that oxalate-rich foods cause Crohn's disease or ulcerative colitis. The new research suggests that in people who already have IBD, an impaired ability to clear oxalate may worsen existing inflammation. For healthy individuals, spinach, almonds, and similar foods remain safe and nutritious as part of a normal diet.
3. Should healthy people avoid oxalate-rich foods like spinach and almonds?
No. Researchers were explicit that this study does not support removing spinach, almonds, sweet potatoes, or other oxalate-containing plant foods from a general healthy diet. These foods provide fibre, healthy fats, and micronutrients most people need. The findings apply specifically to how an inflamed gut in IBD processes oxalate, not to food safety for the wider population.
4. How can someone with IBD manage oxalate-rich foods safely?
Anyone with Crohn's disease or ulcerative colitis who suspects oxalate-rich foods worsen their symptoms should speak with a gastroenterologist or registered dietitian before making changes. Since this research is still early, formal dietary guidelines have not changed. A professional can help assess personal triggers and suggest safe portions rather than eliminating nutrient-dense foods altogether.
