Research shows that a gene called DENND5B controls how your intestines handle dietary fat, and mice without this gene had lower blood fat levels after eating and less body fat overall. According to Gram Research analysis, the intestines burned more fat for energy instead of absorbing it, a process involving cellular cleanup and mitochondrial activity. This effect differed between males and females, potentially explaining why men and women gain weight differently.
Scientists found that a gene called DENND5B controls how your body handles fat from food. When this gene is turned off in mice, their bodies burned more fat in the intestines instead of storing it, leading to less body fat overall. Interestingly, this effect worked differently in male and female mice, which helps explain why men and women sometimes gain weight differently. According to Gram Research analysis, this discovery could eventually lead to new treatments for obesity and heart disease by targeting how our intestines process dietary fat.
Key Statistics
A 2026 study published in the Journal of Lipid Research found that mice with deleted DENND5B genes showed significantly reduced postprandial plasma triglyceride elevations compared to normal mice in both sexes.
Research revealed that DENND5B deletion prevented normal chylomicron secretion in the intestines, causing dietary fatty acids to be oxidized through autophagy and mitochondrial beta-oxidation instead of being absorbed and stored.
The study demonstrated sex-biased differential impacts of DENND5B deletion on body composition and dietary fatty acid uptake, with males and females showing distinct metabolic responses to the gene deletion.
The Quick Take
- What they studied: How a specific gene (DENND5B) affects the way your body absorbs and processes fat from food, and whether it contributes to differences between men and women in weight gain.
- Who participated: The research involved both human genetic data and laboratory mice with and without the DENND5B gene. Researchers compared how males and females responded differently to the gene deletion.
- Key finding: Mice without the DENND5B gene had lower fat levels in their blood after eating and less overall body fat. Their intestines burned more dietary fat instead of packaging it for storage and absorption.
- What it means for you: This research is early-stage but suggests that blocking this gene’s function might help people lose weight and reduce heart disease risk. However, this is not yet a treatment—it’s a fundamental discovery that scientists will need to study further before any human applications.
The Research Details
Researchers used two main approaches: they analyzed human genetic data to see if DENND5B was linked to body fat, and they created mice without the DENND5B gene to study what happens. They measured blood fat levels after the mice ate, looked at how much fat was stored in their bodies, and examined what was happening inside their intestinal cells at the microscopic level.
The team compared male and female mice to understand sex differences. They also studied the cellular machinery—specifically a process called autophagy (where cells clean up and recycle their own components) and mitochondrial beta-oxidation (how cells burn fat for energy)—to figure out the mechanism behind their observations.
This combination of human genetic studies and controlled animal experiments allowed researchers to identify a gene’s role and understand the biological pathway involved.
Understanding how genes control fat absorption is crucial because high blood fat levels after eating are linked to obesity and heart disease. Most research focuses on how the liver and muscles handle fat, but this study highlights the intestines’ role. The sex-based differences are particularly important because men and women have different risks for heart disease, and this gene may partially explain why.
This research was published in the Journal of Lipid Research, a respected peer-reviewed journal. The study combined human genetic analysis with detailed animal experiments, which strengthens the findings. However, because the work was done in mice, results may not directly translate to humans. The specific sample sizes for human genetic analysis were not provided in the abstract, which limits our ability to assess that component fully.
What the Results Show
The main discovery is that mice lacking the DENND5B gene had significantly lower levels of fat in their blood after eating compared to normal mice. This effect occurred in both males and females, but the impact on body fat storage differed between sexes—suggesting the gene affects males and females differently.
When the DENND5B gene was deleted, the mice’s intestines couldn’t properly package dietary fat into particles called chylomicrons, which normally transport fat through the bloodstream. Instead of this fat being absorbed and stored, the intestinal cells activated a cellular cleanup process called autophagy and burned the fat through mitochondrial beta-oxidation (cellular energy production).
This means the intestines essentially became better at destroying dietary fat rather than absorbing it. The mice with the deleted gene ended up with less total body fat, suggesting this mechanism could theoretically help prevent weight gain.
The research revealed that biological sex significantly influences how this gene affects body composition and fat metabolism. Males and females showed different patterns in how much body fat they accumulated and how their intestines processed dietary fat. This finding is important because it suggests that sex hormones or sex-specific genetic factors interact with DENND5B to control fat handling.
Previous research has focused mainly on the liver and muscles in controlling blood fat levels and obesity. This study adds to growing evidence that the intestinal epithelium (the lining of the intestines) plays a more active role in fat metabolism than previously thought. The discovery also provides a molecular explanation for why men tend to have higher blood fat levels after eating compared to women—a well-known observation that lacked a clear biological explanation.
The primary limitation is that this research was conducted in mice, and results may not directly apply to humans. Mice metabolism differs from human metabolism in important ways. The study doesn’t yet show whether blocking this gene in humans would be safe or effective. Additionally, the abstract doesn’t provide complete sample sizes for the human genetic analysis portion. The research is also correlational in humans (showing association) rather than proving cause-and-effect. Finally, this is a single study, so findings need replication by other research groups.
The Bottom Line
At this stage, there are no direct recommendations for the general public. This is fundamental research that identifies a potential drug target. People interested in weight management should continue following established advice: balanced diet, regular exercise, and adequate sleep. Those with high cholesterol or heart disease risk should work with their healthcare providers on proven interventions. This research may eventually lead to new medications, but that is years away.
This research is most relevant to people with obesity, high blood fat levels, or heart disease risk—particularly men, who show higher postprandial triglyceride levels. Researchers and pharmaceutical companies developing new obesity treatments should pay attention. People with family histories of heart disease may find this relevant as background science. However, this is not yet actionable for individual patients.
This is early-stage research. Even if DENND5B becomes a drug target, it typically takes 10-15 years from basic discovery to human clinical trials, and several more years for FDA approval. Don’t expect treatments based on this work for at least a decade.
Frequently Asked Questions
What is the DENND5B gene and why does it matter for weight loss?
DENND5B controls how your intestines package and absorb dietary fat. When this gene is blocked in mice, their intestines burn fat instead of storing it, resulting in less body fat. This discovery could eventually lead to obesity treatments, though human applications are years away.
Why do men and women gain weight differently according to this research?
The study found that DENND5B affects males and females differently in how they process dietary fat. Men naturally have higher blood fat levels after eating, and this gene may partially explain that sex difference, though the exact mechanisms need further research.
Can I use this research to lower my triglycerides right now?
Not directly—this is early-stage research in mice. Current proven methods for lowering triglycerides include reducing refined carbohydrates, limiting alcohol, exercising regularly, and eating omega-3 rich foods. Consult your doctor about your individual triglyceride levels.
How does autophagy relate to this fat-burning discovery?
Autophagy is your cells’ natural cleanup process. When DENND5B is blocked, intestinal cells activate autophagy to break down accumulated fat and burn it for energy instead of absorbing it. This cellular recycling mechanism appears key to the weight-loss effect observed.
When will treatments based on this DENND5B research be available?
This is fundamental research, not yet tested in humans. Drug development typically takes 10-15 years from discovery to clinical trials. Any DENND5B-targeting treatment is likely at least a decade away, pending further research and safety testing.
Want to Apply This Research?
- Track postprandial blood fat levels (triglycerides measured 2-4 hours after eating) if you have access to testing. Note the meal composition and time of day to identify patterns in your personal fat metabolism response.
- Use the app to log meals high in dietary fat and monitor energy levels and satiety. This helps you understand your individual response to fat intake while future research develops DENND5B-targeting treatments.
- Establish a baseline of your typical postprandial triglyceride levels and body composition metrics. As new research emerges on DENND5B, you’ll be able to compare your personal data to population findings and discuss potential future treatments with your doctor.
This research is preliminary and was conducted in mice. Results have not been tested in humans and should not be interpreted as medical advice or a basis for treatment decisions. The findings represent early-stage basic science that may eventually contribute to future therapies, but no DENND5B-targeting treatments currently exist for human use. Anyone with concerns about body weight, blood fat levels, or heart disease risk should consult with a qualified healthcare provider. This article is for educational purposes only and does not replace professional medical guidance.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.