A simple daily fiber supplement reduced arthritis pain and improved strength in a new clinical trial, researchers report. People with knee osteoarthritis who took a prebiotic fiber called inulin experienced significant reductions in pain, improved grip strength and decreased sensitivity to pain, according to the study from the University of Nottingham.
Knee osteoarthritis illustration (Credits: ScienceDaily)
The findings, published in the journal Nutrients, point to a surprising connection between gut health and joint pain. Researchers found the benefits may be linked to changes in gut bacteria and the hormone GLP-1, opening up a new avenue for arthritis research.
Fiber Supplement Arthritis Trial: What the Study Found
Knee osteoarthritis affects hundreds of millions of people worldwide and is a major cause of chronic pain and disability, especially among older adults. As cartilage in the knee gradually deteriorates, everyday activities such as walking or climbing stairs can become painful and difficult.
In the trial, inulin appeared notably easier for participants to stick with than a digital physical therapy programme. Only 3.6% of those assigned to inulin alone dropped out, compared with 21% of those assigned to physical therapy alone, the researchers reported.
How Inulin and Gut Bacteria May Link to Arthritis Pain
Inulin is a naturally occurring fiber found in foods such as chicory root and Jerusalem artichokes. It is not broken down in the small intestine; instead it passes to the large intestine, where beneficial bacteria ferment it into substances called short-chain fatty acids, including butyrate, which supports the intestinal lining and can influence inflammation and pain pathways.
Lead author Dr Afroditi Kouraki, from the University of Nottingham’s School of Medicine, said the study raises the exciting possibility that a simple dietary change — adding a fiber supplement to breakfast or yogurt — could meaningfully reduce pain and improve physical function for people with knee osteoarthritis.
The researchers stress this is a study finding, not a treatment recommendation, and further research will be needed to confirm how widely the approach could help. But for a condition that affects so many people, even a simple new lead is welcome news.
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