According to research reviewed by Gram, adding the probiotic Lactobacillus delbrueckii to feed at 0.2% reduced intestinal damage and diarrhea in weaned piglets facing inflammation. In the 2026 study, 72 piglets across two experiments showed lower gut stress and inflammation, with the strongest effects in the ileum. These findings apply to pigs only.
According to research reviewed by Gram, a probiotic bacteria called Lactobacillus delbrueckii may help protect the gut when inflammation strikes. Scientists tested it in young pigs that had recently been separated from their mothers, a stressful time that often leads to gut problems. Pigs that received the probiotic in their feed showed less intestinal damage, fewer harmful inflammatory signals, and, in a longer experiment, fewer cases of diarrhea. The probiotic appeared to calm cell stress and reduce the death of cells lining the intestines, with the strongest effects in the lower part of the small intestine, called the ileum. Because this was an animal study, it does not show the same effects in people. Still, it adds to growing interest in targeted probiotics for gut health.
Key Statistics
A 2026 animal study of 72 weaned piglets found that adding 0.2% Lactobacillus delbrueckii to their feed reduced intestinal injury and diarrhea during a longer period of inflammation.
In a 2026 study of 36 weaned piglets in an acute inflammation model, the probiotic significantly reduced stress-related genes GRP78, PERK, ATF6, and CHOP in the ileum.
The Quick Take
- What they studied: Whether a probiotic bacteria added to pig feed could protect the intestines from inflammation and damage, and how it might work inside the gut.
- Who participated: 72 young pigs, split into two experiments of 36 each. Weaned pigs are recently separated from their mothers and switched to solid food, a stressful time for the gut. Each experiment had three groups of 12 pigs.
- Key finding: In the short-term experiment, the probiotic reduced intestinal damage, lowered inflammatory signals, and restored a calming signal called IL-10. In the longer experiment, it significantly reduced diarrhea rates and gut injury scores. Some stress markers only trended lower in the jejunum, so the effects were not uniform along the intestine.
- What it means for you: This research was done in pigs, not people, so it cannot tell you what this probiotic will do for your gut. It does suggest that certain probiotics may be worth studying for gut health. Anyone with ongoing digestive concerns should talk with a doctor.
The Research Details
The researchers ran two separate experiments, each with 36 weaned piglets. The pigs were divided evenly into three groups of 12: a control group that received regular feed and a saline shot, a group that received a shot of LPS, and a group that received feed with added probiotic plus the LPS shot. Each group was housed in six pens with two pigs per pen.
LPS is a substance from the outer wall of certain bacteria. Injecting it triggers inflammation in a controlled way, which lets researchers study the gut’s response without relying on a natural infection. The first experiment was an acute model, meaning a short and intense inflammation episode. The second was a chronic model, meaning a longer period of ongoing inflammation, during which diarrhea was tracked.
Afterward, the team examined intestinal tissue and gene activity. They used a broad screening method to see which biological pathways changed, then measured specific genes and proteins to confirm those pathways.
Testing two models shows whether the probiotic helps both during a quick inflammatory hit and over a longer period, which is closer to real-world conditions. Measuring tissue, genes, and proteins together helps explain how an effect happens, not just whether it happens. Random assignment of pigs to groups also helps reduce bias, so differences between groups are more likely to come from the feed itself.
Strengths include a control group, random assignment, replicate pens, and several measurement methods. The study was published in a peer-reviewed journal, which means outside experts reviewed it before publication. Limits include relatively small group sizes, the use of one probiotic strain at one dose, and some results that were only trends rather than clear, statistically reliable differences. The abstract does not provide every detail, so the full paper should be reviewed for complete data.
What the Results Show
In the short-term experiment, the probiotic reduced damage to the intestinal lining. Pigs that received it showed less structural damage in gut tissue compared with pigs given LPS alone.
The probiotic also lowered levels of inflammatory signals and helped restore IL-10, a messenger that calms inflammation. It reduced NF-κB, a protein switch that turns on inflammation, from moving into the cell nucleus where it drives gene activity. Gene analysis pointed to endoplasmic reticulum stress, a cell stress response, and programmed cell death, called apoptosis, as central pathways affected by both the LPS and the probiotic.
The effects were not even along the intestine. In the ileum, the probiotic clearly reduced several stress genes, including GRP78, PERK, ATF6, and CHOP, along with a stress protein called p-IRE1α. In the jejunum, similar changes appeared only as trends that did not reach the usual threshold for reliability. Cell death also dropped, with a stronger effect in the ileum.
In the longer experiment, the probiotic significantly reduced diarrhea rates and intestinal injury scores. It also increased HO-1, a protective enzyme, restrained NF-κB activity, and helped rebalance pro-inflammatory and anti-inflammatory chemical messengers that signal the immune system.
Beyond the main outcomes, the researchers reported that the probiotic helped bring inflammatory and calming signals back into balance in both experiments. The clearest benefits appeared in the ileum. This suggests that where an effect shows up along the gut may matter, although more research is needed to confirm this pattern and understand why it happens.
Earlier research has linked several Lactobacillus strains to better gut barrier function and lower inflammation in animals and, in some studies, in people. However, results vary widely by strain, dose, and host. This study adds detail on the specific cell stress pathways involved, which may help explain why some probiotics appear to work better than others.
This was an animal study, so the results may not apply to humans. The inflammation was triggered by an injected substance, which mimics but does not fully reproduce a natural infection. Group sizes were modest, and only one probiotic strain at one dose was tested. Several key findings in the jejunum were trends rather than clear results. The study also does not report long-term outcomes after the feeding period ended, and it does not establish whether the same benefits would hold on commercial farms with different conditions.
The Bottom Line
For pig producers and feed researchers, the evidence supports further testing of this probiotic as a feed additive. Confidence is moderate because the findings come from a single study with a limited number of animals. For people, this research does not provide grounds to take this probiotic for gut health. Confidence in any human application is very low until human studies are conducted.
Livestock nutritionists, farmers, and veterinarians who manage young pigs should find this research relevant. People interested in gut health can read it as early background information, but it should not change their supplement choices on its own. Anyone with ongoing diarrhea, abdominal pain, or other digestive symptoms should see a healthcare provider rather than rely on this study.
The abstract does not state the exact timing of measurements in the study. Gut changes from diet or probiotics in people typically take several weeks to become noticeable, and benefits vary from person to person. Do not expect quick or guaranteed results from this research alone.
Frequently Asked Questions
Does Lactobacillus delbrueckii help human gut health?
This study did not test people. It was conducted in 72 weaned piglets, so the results cannot be directly applied to humans. Human research on this specific probiotic is needed before drawing conclusions about its effects on people.
Did a probiotic reduce diarrhea in the pig study?
In the chronic inflammation model, piglets fed 0.2% Lactobacillus delbrueckii had significantly lower diarrhea rates and intestinal injury scores than piglets given inflammation without the probiotic. That model included 36 piglets.
How does a probiotic reduce gut inflammation?
In the study, the probiotic appeared to calm endoplasmic reticulum stress, a cell stress response, and reduce cell death in the intestinal lining. It also dampened NF-κB, a protein switch that drives inflammation, and helped restore a healthier balance of inflammatory signals.
Want to Apply This Research?
- Log your bowel habits daily using a 1 to 5 stool consistency scale, count loose stool episodes each day, and rate any bloating or abdominal discomfort from 0 to 10. Track these for at least 4 weeks before and after any change in diet or supplements.
- Add fiber-rich foods and fermented foods you already tolerate, such as yogurt with live cultures or kefir, and note in the app how each one affects your digestion. Talk with a clinician before starting any probiotic supplement, especially if you have a medical condition or take medication.
- Review your symptom trends monthly to see whether loose stool counts or discomfort scores change over several months. Share the summaries with a doctor or registered dietitian, and seek medical advice if symptoms persist, worsen, or include blood or unexplained weight loss.
This article summarizes an animal study in weaned piglets and does not provide medical or veterinary advice. Results may not apply to humans or to other animals. Consult a qualified doctor, registered dietitian, or veterinarian before changing your diet or starting any supplement for gut health.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.