Background: To explore possible anti-inflammatory effects of the specific carbohydrate diet in children with juvenile idiopathic arthritis. This diet has shown anti-inflammatory effect in children with inflammatory bowel disease.
Methods: Twenty-two patients with juvenile idiopathic arthritis (age 6.3-17.3 years), with ≤2 inflamed joints and an erythrocyte sedimentation rate < 30 mm/h, were included in this explorative study. Fifteen children completing four weeks on the diet were evaluated. A dietician introduced parents and children to the diet, and two follow-ups were performed during the intervention. Conventional laboratory tests and multiplex analyses of 92 inflammatory proteins were used. Short-chain fatty acids in faecal samples were examined.
Results: The diet significantly decreased morning stiffness (p = 0.003) and pain (p = 0.048). Physical function, assessed through the child health assessment questionnaire, improved (p = 0.022). Arthritis improved in five of the seven children with arthritis; in those seven, multiplex analyses showed a significant decrease in nine inflammatory proteins, including TNF-alpha (p = 0.028), after four weeks. Faecal butyrate, analysed in all 15 participants, increased significantly (p = 0.020).
Conclusion: The specific carbohydrate diet may have significant positive effects on arthritis in children with juvenile idiopathic arthritis, but further studies are needed.
Clinical trials identifier: NCT04205500 , 2019/12/17, retrospectively registered. URL: https://register.clinicaltrials.gov.
Keywords: Arthritis; Diet therapy; Juvenile idiopathic; Pilot study.