Pro-inflammatory diets and sciatica: Impact on chronic pain and disability risk

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Created On: 01/04/2026

Sciatica, a prevalent form of neuropathic pain, is a major contributor to chronic lower back pain, reduced mobility, and functional disability.

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Key take away

Higher dietary inflammatory index scores independently predict increased pain severity and functional disability in sciatica, through inflammation pathways beyond C-reactive protein.

Background

Sciatica, a prevalent form of neuropathic pain, is a major contributor to chronic lower back pain, reduced mobility, and functional disability. Recent research highlights the role of diet-triggered inflammation in the progression of chronic pain conditions. This cross-sectional study determined the connection between dietary inflammatory index (DII) and clinical outcomes in sciatica patients.

Method

This study included 598 individuals diagnosed with sciatica across two hospitals in China. The DII was derived from validated food frequency questionnaires to examine dietary patterns. Pain intensity and disability levels were evaluated via the visual analog scale (VAS) and oswestry disability index (ODI), respectively. Furthermore, C-reactive protein (CRP) levels were checked as a systemic inflammation marker. Advanced statistical methods, including multivariable regression analysis, correlation analysis, mediation analysis, and restricted cubic spline modeling, were employed.

Result

Among the 598 volunteers (mean age: 55.6 years; 47.5% male), higher DII scores—indicating a more pro-inflammatory diet—were substantially connected with increased pain severity and disability. Each 1-unit rise in DII was linked to a 0.48-point rise in VAS pain score and a 4.75-point rise in ODI disability score (p < 0.001). The association with pain exceeded the minimal clinically important difference, underscoring its clinical relevance. Notably, CRP levels exhibited no prominent association with DII, and no mediating effect of CRP was observed. Nonlinear dose–response relationships further supported the impact of dietary inflammation on clinical outcomes.

Conclusion

A pro-inflammatory diet was independently associated with worsening sciatica pain and greater functional impairment, as reflected by higher DII scores. These effects appear to operate via complex inflammatory pathways beyond CRP, suggesting the importance of anti-inflammatory dietary strategies in sciatica care. Incorporating targeted nutritional interventions may improve pain control and functional recovery in the affected patients.