A Gram Research analysis of a 2026 study found that combining a special nutrition drink with an exclusion diet improved gut bacteria health in 30 ulcerative colitis patients, though it didn’t work faster than standard treatment for achieving symptom remission. After 4 weeks, the nutrition drink group showed significantly increased beneficial bacteria and decreased harmful bacteria, with a healthier bacterial profile associated with lower disease severity. While 67% achieved remission compared to 83% in standard care, the nutrition drink approach showed promise for managing rectal bleeding and potentially reducing medication needs.
Researchers tested whether a special nutrition drink combined with an exclusion diet could help people with ulcerative colitis (a condition causing gut inflammation). In a 4-week study, 30 patients received the nutrition drink plus an elimination diet alongside standard treatment, while 30 others received standard treatment alone. Although both groups improved similarly, the nutrition drink group showed remarkable changes in their gut bacteria—developing more beneficial microbes and fewer harmful ones. These findings suggest that dietary approaches may help restore healthy gut bacteria in people with mild to moderate colitis, though longer studies are needed to confirm lasting benefits.
Key Statistics
A 2026 quasi-experimental study of 60 ulcerative colitis patients found that combining partial enteral nutrition with an exclusion diet increased beneficial gut bacteria and reduced harmful bacteria within 4 weeks, despite not achieving faster clinical remission than standard treatment alone.
In a 2026 study of 30 patients receiving partial enteral nutrition plus an exclusion diet, only 56.7% experienced rectal bleeding at week 4 compared to 86.7% in the standard care group, representing a statistically significant improvement in this specific symptom.
A 2026 analysis of 14 ulcerative colitis patients showed that partial enteral nutrition combined with an exclusion diet significantly improved gut bacterial diversity and shifted the microbiome toward a healthier profile, which was negatively associated with disease severity.
The Quick Take
- What they studied: Whether combining a special nutrition drink with an elimination diet (avoiding certain foods) could help people with ulcerative colitis feel better and restore healthy gut bacteria
- Who participated: 60 adults with mild to moderate ulcerative colitis (30 in each group). Participants were assigned to either receive the nutrition drink plus elimination diet with standard care, or standard care alone for 4 weeks
- Key finding: After 4 weeks, 67% of the nutrition drink group achieved remission (symptom relief) compared to 83% in the standard care group. However, the nutrition drink group showed significant improvements in gut bacteria diversity and beneficial microbe growth
- What it means for you: Dietary interventions may help restore healthy gut bacteria in colitis patients, though they may not work faster than standard medications. This suggests a complementary approach worth exploring, but longer studies are needed before making major dietary changes
The Research Details
This was a quasi-experimental study, meaning researchers assigned patients to groups based on their choice rather than randomly. Sixty patients with mild to moderate ulcerative colitis participated for 4 weeks. One group (30 patients) received a partial enteral nutrition drink (a medical food supplement) combined with an exclusion diet (removing foods that commonly trigger symptoms) plus their regular treatment. The other group (30 patients) received only their regular standard treatment.
The exclusion diet removed foods like dairy, gluten, and high-fat items that often worsen colitis symptoms. The nutrition drink provided balanced nutrition while being easier on the inflamed gut. Researchers measured whether patients achieved remission (symptom relief) using a standard scoring system. They also analyzed stool samples from 14 patients in the nutrition drink group to examine changes in gut bacteria composition.
Understanding how diet affects the gut bacteria of colitis patients is important because the bacteria in our intestines play a major role in inflammation and healing. By examining both clinical symptoms and bacterial changes, this study provides insight into how dietary interventions work at a biological level, not just whether they reduce symptoms. This approach helps explain why some dietary approaches might have long-term benefits even if they don’t work as quickly as medications.
This study has some important limitations to understand: it was not randomized (patients weren’t randomly assigned), it was open-label (both patients and doctors knew who received the diet), and it only lasted 4 weeks. The microbiome analysis included only 14 patients, which is a small number. However, the study was prospective (following patients forward in time) and used standardized measures to assess disease activity, which strengthens the findings. The fact that baseline characteristics were similar between groups supports the validity of comparisons.
What the Results Show
At the 4-week mark, clinical remission rates differed between groups: 66.7% (20 out of 30 patients) in the nutrition drink plus diet group achieved remission compared to 83.3% (25 out of 30) in the standard care group. This means the nutrition drink group didn’t achieve remission faster than standard treatment alone.
However, the nutrition drink group showed better outcomes in one specific symptom: rectal bleeding. Only 56.7% of the nutrition drink group had zero rectal bleeding at week 4, compared to 86.7% of the standard care group—a statistically significant difference. This suggests the nutrition drink approach may help with this particular symptom.
Regarding steroid use (a common medication for colitis), fewer patients in the nutrition drink group needed steroids (16.7% vs 23.3%), though this difference wasn’t statistically significant. The nutrition drink group showed a trend toward needing fewer medications, which could be meaningful for long-term health.
The most striking findings came from analyzing gut bacteria. Patients receiving the nutrition drink plus exclusion diet showed significant improvements in bacterial diversity—meaning their gut bacteria became more varied and balanced. The analysis revealed increased amounts of beneficial bacteria and decreased amounts of harmful bacteria (called pathobionts). The healthier bacterial profile observed in this group was associated with lower disease severity scores, suggesting that restoring healthy bacteria may help control inflammation.
Previous research on diet and ulcerative colitis has been limited, with most studies focusing on medications rather than nutritional approaches. This study adds to growing evidence that what patients eat affects both their symptoms and their gut bacteria composition. The finding that dietary interventions improve bacterial health aligns with recent research showing that gut bacteria play a central role in inflammatory bowel diseases. However, this is one of the first studies to directly compare a nutrition drink plus exclusion diet to standard care while measuring bacterial changes.
Several important limitations affect how we interpret these results. First, the study was not randomized—patients chose their treatment group rather than being randomly assigned, which can introduce bias. Second, it was open-label, meaning both patients and doctors knew who received the special diet, which could influence how they reported symptoms. Third, the study lasted only 4 weeks, which is relatively short for evaluating long-term dietary benefits. Fourth, only 14 patients had their gut bacteria analyzed, making it difficult to draw firm conclusions about bacterial changes. Finally, the study didn’t include a control group that received the nutrition drink without the exclusion diet, so we can’t determine which component (the drink or the diet) provided the benefits.
The Bottom Line
Based on this research, a partial enteral nutrition drink combined with an exclusion diet appears to be a safe complementary approach for people with mild to moderate ulcerative colitis, particularly for managing rectal bleeding. However, it may not work faster than standard medications for achieving overall remission. Consider discussing this dietary approach with your gastroenterologist as a potential addition to standard treatment, not a replacement. The evidence is moderate—promising but not yet definitive. Longer studies are needed before making major dietary changes without medical supervision.
This research is most relevant for people with mild to moderate ulcerative colitis who want to explore dietary approaches alongside their regular treatment. It may be particularly interesting for those experiencing rectal bleeding or wanting to reduce medication use. People with severe colitis should not attempt dietary interventions without close medical supervision. Those with other digestive conditions should consult their doctor before trying an exclusion diet, as it may not be appropriate for all conditions.
Based on this 4-week study, you might expect to see changes in gut bacteria within 2-4 weeks, though symptom improvement may take longer. The study showed that bacterial improvements occurred relatively quickly, but clinical benefits (like remission) took the full 4 weeks. Long-term benefits beyond 4 weeks remain unknown and should be explored in future research. Don’t expect overnight results—give any dietary intervention at least 4 weeks while working with your healthcare provider.
Frequently Asked Questions
Does a special nutrition drink help ulcerative colitis patients get better faster?
A 2026 study found that a nutrition drink plus exclusion diet didn’t achieve remission faster than standard treatment (67% vs 83% at 4 weeks). However, it significantly improved gut bacteria health and reduced rectal bleeding, suggesting potential long-term benefits worth exploring with your doctor.
What foods should I avoid if I have ulcerative colitis?
The exclusion diet in this study removed dairy, gluten, and high-fat foods that commonly trigger colitis symptoms. However, food triggers vary by person. Work with your gastroenterologist or dietitian to identify your specific triggers rather than eliminating foods unnecessarily.
Can diet alone treat ulcerative colitis without medication?
This study suggests diet works best alongside standard treatment, not as a replacement. The nutrition drink plus diet group still needed standard care to achieve remission. Never stop medications without consulting your doctor, as untreated colitis can cause serious complications.
How long does it take to see improvements from dietary changes in colitis?
This 4-week study showed gut bacteria improvements occurred within that timeframe, though symptom relief took the full 4 weeks. Long-term benefits beyond 4 weeks haven’t been studied yet, so patience and medical supervision are important when trying dietary interventions.
What is partial enteral nutrition and how does it help colitis?
Partial enteral nutrition is a medical nutrition drink that provides balanced nutrition in an easily digestible form, reducing stress on the inflamed gut. Combined with an exclusion diet, it appears to help restore healthy gut bacteria and reduce bleeding, though the exact mechanisms need further research.
Want to Apply This Research?
- Track daily rectal bleeding episodes (0 = none, 1 = minimal, 2 = moderate, 3 = severe) and overall symptom severity score using a simple 1-10 scale. Record which foods you ate on days with worse symptoms to identify personal triggers within the exclusion diet framework
- Start by eliminating one food category at a time (dairy first, then gluten, then high-fat foods) over 1-2 weeks rather than removing everything simultaneously. This helps identify which foods trigger your symptoms. Simultaneously, add the nutrition drink as a meal replacement or supplement as directed by your healthcare provider
- Weekly check-ins: photograph stool consistency and frequency, rate bleeding severity, note energy levels and abdominal pain, and record which foods you consumed. After 4 weeks, review patterns to see if symptoms improved and which dietary changes seemed most helpful. Share this data with your gastroenterologist to guide long-term dietary management
This research summary is for educational purposes only and should not replace professional medical advice. Ulcerative colitis is a serious condition requiring ongoing medical supervision. Before making significant dietary changes, eliminating foods, or starting any nutrition supplement, consult with your gastroenterologist or registered dietitian. This study lasted only 4 weeks and involved a small sample size, so results should not be considered definitive. Individual responses to dietary interventions vary significantly. Never discontinue prescribed medications without medical guidance, as untreated ulcerative colitis can lead to serious complications.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.