Researchers discovered that a specific type of gut bacteria called Ligilactobacillus murinus may help reduce binge eating by boosting a brain chemical called serotonin. Using mice bred to overeat, scientists found that this bacteria was missing in animals with binge-eating problems. When they gave the bacteria back to the mice, the animals ate less and made better food choices. The bacteria works by producing a substance that tells the body to make more serotonin, which helps control hunger and food cravings. This discovery suggests that probiotics containing this bacteria could become a new treatment for people struggling with binge eating.
The Quick Take
- What they studied: Whether a specific gut bacteria could reduce binge eating by changing brain chemicals that control hunger and food cravings
- Who participated: Laboratory mice that were specially bred to have binge-eating behaviors similar to humans with overeating disorder
- Key finding: Mice that received the Ligilactobacillus murinus bacteria ate significantly less junk food, consumed fewer total calories, and showed better control over food impulses compared to mice without this bacteria
- What it means for you: This research suggests that probiotics containing this specific bacteria might help people with binge eating in the future, but human studies are still needed to confirm these results work the same way in people
The Research Details
Scientists created mice that mimicked human binge-eating disorder by exposing them to stress and limiting their food access. This caused the mice to overeat when given access to tasty foods, just like people with binge-eating problems do. The researchers then measured the levels of serotonin (a brain chemical that affects mood and hunger) in the mice’s brains and blood.
Next, they removed the mice’s gut bacteria using antibiotics to see what would happen. This made the binge eating worse, proving that gut bacteria play an important role. The team then identified which bacteria were missing in the binge-eating mice by analyzing their gut bacteria using genetic testing. They found that a bacteria called Ligilactobacillus murinus was significantly reduced.
Finally, they gave this specific bacteria back to the mice and measured whether it improved their eating behavior and serotonin levels. They also used special chemicals to block serotonin production to prove that the bacteria’s benefits came specifically from increasing serotonin.
This research approach is important because it proves a direct cause-and-effect relationship between a specific bacteria and binge eating. By removing bacteria and then adding it back, scientists could confirm that the bacteria itself—not something else—was responsible for the improvements. This type of evidence is much stronger than just observing that bacteria levels are different in people with binge eating.
This study was conducted in a controlled laboratory setting with mice, which allows for precise measurements and controlled conditions that would be impossible in humans. However, because it was done in mice rather than people, the results may not work exactly the same way in humans. The research was published in a peer-reviewed scientific journal, meaning other experts reviewed it for quality before publication. The study included multiple tests to confirm the findings, such as genetic analysis and chemical blocking experiments, which strengthens confidence in the results.
What the Results Show
The mice with binge-eating disorder had significantly lower levels of the Ligilactobacillus murinus bacteria compared to normal mice. When researchers gave this bacteria to the binge-eating mice, the animals showed dramatic improvements: they ate less junk food, consumed fewer total calories, and made better choices about what to eat.
The bacteria worked by increasing serotonin levels in three important brain areas: the prefrontal cortex (which controls decision-making), the hippocampus (which affects memory and emotions), and the bloodstream. Serotonin is a chemical messenger that helps regulate mood, appetite, and impulse control.
The mechanism behind this improvement is fascinating: the bacteria produces a substance called indole-3-acetic acid that activates a cellular pathway called aryl hydrocarbon receptor signaling. This activation tells the body to produce more of two key enzymes (TPH1 and TPH2) that are responsible for making serotonin. When researchers blocked serotonin production with a chemical inhibitor, the bacteria’s benefits disappeared, proving that increased serotonin was the reason for the improvement.
The study also showed that removing all gut bacteria with antibiotics made binge eating worse and further decreased serotonin levels, confirming that healthy gut bacteria are protective against binge eating. The genetic analysis revealed that binge-eating mice had reduced diversity in their gut bacteria overall, not just lower levels of Ligilactobacillus murinus. The correlation between the amount of this bacteria and serotonin levels was strong and consistent across multiple measurements.
Previous research has linked gut bacteria imbalance (called dysbiosis) to binge eating and other eating disorders, but scientists didn’t know which specific bacteria were important or how they worked. This study fills that gap by identifying Ligilactobacillus murinus as a key player and explaining the exact mechanism—through serotonin production—by which it helps control eating behavior. The finding that gut bacteria influence serotonin levels supports growing evidence that the gut-brain connection is crucial for mental health and behavior.
The most important limitation is that this research was conducted in mice, not humans. Mice and humans have different digestive systems and brain chemistry, so the results may not translate directly to people. The study also didn’t test whether giving people this bacteria would actually reduce binge eating. Additionally, the sample size of mice used wasn’t specified in the abstract, so we don’t know how many animals were studied. The research was conducted in a laboratory setting with controlled conditions, which is very different from real-world life where many other factors affect eating behavior. Finally, this study doesn’t address whether the bacteria would work for people with different causes of binge eating or other eating disorders.
The Bottom Line
Based on this research, we cannot yet recommend that people take probiotics containing Ligilactobacillus murinus to treat binge eating. This is early-stage research in mice that shows promise, but human clinical trials are needed first. If you struggle with binge eating, talk to a doctor or mental health professional about evidence-based treatments like cognitive behavioral therapy, which has strong scientific support. Once human studies are completed, probiotics containing this bacteria might become an additional treatment option to discuss with your healthcare provider.
People who experience binge eating or overeating disorder should pay attention to this research because it offers hope for new treatment options. Mental health professionals and doctors who treat eating disorders should follow this research as it develops toward human trials. People interested in the gut-brain connection and how probiotics work will find this research particularly interesting. However, people without binge-eating problems don’t need to change their behavior based on this single mouse study.
If this research eventually leads to human trials and treatments, it will likely take several years before probiotics containing this bacteria become available as a medical treatment. Even then, benefits would probably develop gradually over weeks to months of consistent use, similar to how other probiotic treatments work. This is not a quick fix, but rather a potential long-term support strategy that would likely work best combined with other treatments like therapy.
Want to Apply This Research?
- Track daily binge-eating episodes and food cravings on a scale of 1-10 to establish a baseline. If probiotic treatment becomes available in the future, users could measure changes in frequency of binge episodes, intensity of cravings, and ability to stop eating when satisfied.
- Users could set daily reminders to take a probiotic supplement (once available), log their meals and eating patterns, and track mood changes that might accompany improved serotonin levels. The app could provide educational content about the gut-brain connection and offer complementary strategies like stress management and sleep tracking.
- Implement a weekly summary view showing trends in binge-eating frequency, food choice quality, and mood. Users could compare their data month-to-month to see if the probiotic is helping over time. Integration with a healthcare provider could allow doctors to review the data and adjust treatment as needed.
This research was conducted in mice and has not yet been tested in humans. The findings are promising but preliminary. Binge eating disorder is a serious medical condition that requires professional treatment. If you struggle with binge eating, please consult with a doctor, registered dietitian, or mental health professional before making any changes to your diet or starting new supplements. This article is for educational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. Do not start any new probiotic supplements without first discussing it with your healthcare provider, especially if you have a compromised immune system or are taking medications.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.