Mediterranean diet and periodontitis: the influence of nutrition on inflammation and disease severity

A recent study by scientists from King’s College London demonstrates that adherence to a Mediterranean diet, rich in fruits, vegetables, whole grains, legumes, nuts, and olive oil, may reduce the severity of periodontitis and decrease systemic inflammation. At the same time, limiting red and processed meat is associated with more favorable periodontal outcomes.

Study design

The study was cross-sectional and included 195 patients diagnosed with stage III–IV periodontitis. Participants provided information about their dietary habits, underwent periodontal examination, and had blood tests for inflammatory biomarkers. The primary objective was to assess the association between diet and the severity of periodontal disease.

Key findings

• High adherence to the Mediterranean diet was associated with less severe periodontitis, shallower probing depths, reduced loss of clinical attachment, and improved overall periodontal tissue health.
• Serological data showed elevated levels of interleukin-6 (IL-6) in patients with severe periodontitis. IL-6 is a pro-inflammatory cytokine associated with tissue destruction and systemic diseases, such as cardiovascular pathologies and diabetes.
• High-sensitivity C-reactive protein (hsCRP), after adjustment for confounding factors, did not demonstrate a strong correlation with disease severity, indicating the specificity of IL-6 as a biomarker of inflammatory activity.
• Frequent consumption of plant-based foods was inversely associated with systemic inflammatory markers, whereas regular consumption of red meat was associated with more severe periodontitis.

Clinical significance

The study’s findings support the growing understanding of nutrition as a modifiable factor in periodontal health. The Mediterranean diet, known for its cardioprotective and neuroprotective effects, now demonstrates a potential protective role against periodontal breakdown. In contrast, diets high in saturated fats and animal proteins promote oxidative stress and microbiota dysbiosis, which may accelerate the progression of periodontitis.

Conclusion

Adherence to the Mediterranean dietary pattern may become part of a comprehensive strategy for preventing and treating severe forms of periodontitis by reducing local and systemic inflammation. These findings support the integration of dietary counseling into the clinical practice of dentists and periodontology specialists.