Prebiotics reshaped gut microbiota composition and function, increased diet-derived carbohydrate availability, mitigated mucosal barrier disruption, reduced systemic inflammation and metabolic dysregulation, ultimately enhancing metabolic health and improving physical performance in adults with comorbid knee OA and obesity, while also reducing tibial cartilage degeneration and synovial membrane thickening in a diet-induced obese rat model.
Key Findings
Results
Prebiotic supplementation improved physical function and metabolic health in adults with comorbid knee osteoarthritis and obesity through gut microbiota-mediated mechanisms.
The study integrated metagenomic and metabolomic analyses to investigate prebiotic fiber-linked mechanisms along the gut-knee axis.
Prebiotics reshaped the composition and function of the gut microbiota as a primary mechanism of action.
Improvements in physical performance were associated with systemic changes in inflammation and metabolic dysregulation.
The study design included a human clinical component in adults with both knee OA and obesity.
Results
Prebiotics increased diet-derived carbohydrate availability and mitigated excessive host-glycan degradation and mucosal barrier disruption.
Metagenomic analysis revealed functional shifts in gut microbial carbohydrate metabolism following prebiotic supplementation.
Excessive host-glycan degradation, a marker of mucosal barrier compromise, was reduced in the prebiotic group.
Mucosal barrier disruption was mitigated, suggesting preservation of gut barrier integrity.
These changes were identified through integrated metagenomic and metabolomic analyses.
Results
Prebiotic supplementation reduced systemic inflammation and metabolic dysregulation in adults with obesity and knee osteoarthritis.
Reductions in systemic inflammation were linked to gut microbiota compositional and functional changes induced by prebiotics.
Metabolic dysregulation was attenuated alongside improvements in metabolic health markers.
Metabolomic profiling was used to capture systemic metabolic changes associated with prebiotic intake.
These findings provide mechanistic evidence supporting prebiotic supplementation as a conservative management strategy.
Results
In a diet-induced obese rat model, prebiotics reduced tibial cartilage degeneration and synovial membrane thickening.
The preclinical component used a diet-induced obese rat model to assess OA-related joint pathology.
Prebiotic treatment led to measurable reductions in tibial cartilage degeneration.
Synovial membrane thickening, a marker of joint inflammation, was also reduced in prebiotic-treated rats.
Protection against OA onset and progression was conferred through a common inflammatory pathway shared between the human and rat findings.
These results support a preventive role for prebiotics in obesity-related knee OA.
Conclusions
The therapeutic effects of prebiotics on knee osteoarthritis and metabolic health are mediated through the gut-joint axis.
The gut-joint axis was identified as the mechanistic pathway linking prebiotic-induced microbiota changes to joint outcomes.
Both human and rat data converged on a common inflammatory pathway as the mediating mechanism.
The multiomics approach (metagenomics + metabolomics) provided integrated mechanistic evidence for this axis.
Findings support prebiotic supplementation as both a conservative management strategy in humans and a preventive approach in preclinical models.
Background
Knee osteoarthritis is a prevalent degenerative disease lacking effective disease-modifying drugs, and the rise in obesity has increased the prevalence of metabolic OA.
The paper describes knee OA as 'a prevalent, painful, degenerative disease lacking effective disease-modifying drugs.'
Obesity has specifically increased the prevalence of what the authors term 'metabolic OA.'
Effective management strategies are needed to delay or prevent knee replacement surgery.
This context motivates the investigation of prebiotic supplementation as a conservative management approach.
What This Means
This research suggests that taking prebiotic fiber supplements can improve joint health, physical function, and metabolic health in people who are both obese and have knee osteoarthritis, and that these benefits work through changes in the gut microbiome. Using a combination of genetic sequencing of gut bacteria (metagenomics) and analysis of chemicals in the body (metabolomics), the researchers found that prebiotics changed the types and activities of bacteria living in the gut in ways that made more carbohydrates available for healthy bacteria, protected the gut lining from damage, and reduced body-wide inflammation and metabolic problems. These chain of events appears to ultimately lead to better physical performance and metabolic health in the study participants.
In addition to the human study, the researchers tested prebiotics in rats that were made obese through their diet. In these animals, prebiotic supplementation reduced cartilage breakdown in the knee and decreased thickening of the joint lining (synovial membrane), which are both signs of osteoarthritis progression. Importantly, both the human and rat findings pointed to the same inflammatory pathway as the key mechanism, strengthening the evidence that the gut and the knee joint are connected in a meaningful way — what the authors call the 'gut-joint axis.'
This research suggests that prebiotic supplementation could serve as a practical, non-surgical strategy for managing knee osteoarthritis in people who are also obese, potentially slowing disease progression by targeting gut bacteria rather than the joint directly. The findings also raise the possibility that prebiotics could help prevent obesity-related knee osteoarthritis from developing in the first place, though further clinical trials would be needed to confirm these effects and determine optimal dosing and duration.
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Wang W, Fortuna R, Mayengbam S, Seerattan R, Mu C, Rios J, et al.. (2026). Multiomics insights into the effects of prebiotics on physical function and metabolism in adults with obesity and knee osteoarthritis.. Gut microbes. https://doi.org/10.1080/19490976.2026.2679516