A UK study suggests that strict adherence to a Mediterranean diet may improve periodontal disease outcomes. Published in the Journal of Periodontology, the study focused on the impact of diet on oral health and systemic inflammation.
Researchers assessed 200 hospitalized patients, tracking their dental health and blood markers of inflammation. Of the 195 patients with complete data, 112 reported strict adherence to a Mediterranean diet, while the remaining patients followed a less healthy diet, including a high intake of red meat.
The results showed that patients who did not follow a Mediterranean diet were more likely to develop severe gum disease. Frequent consumption of red meat was strongly associated with advanced periodontitis, while plant-based foods were associated with lower levels of blood markers of inflammation.
“Diet appears to influence gum disease primarily through inflammation,” said Dr. Giuseppe Manas of King’s College London. “A Mediterranean diet rich in vegetables and legumes may help indirectly prevent or improve periodontal disease.”
Professor Luigi Nibali, a co-author of the study and an expert in host-microbiome interactions, noted that a diet high in sugar and refined carbohydrates can also impair oral health, while highly processed foods have a negative impact on periodontal health. Elevated levels of pro-inflammatory molecules such as interleukin-6 are strongly associated with poor gum health.
Periodontitis affects 40-50% of the population, and approximately 10% of cases lead to tooth loss. Beyond the mouth, periodontal bacteria can spread through the bloodstream, triggering systemic inflammation and contributing to non-communicable diseases such as cardiovascular disease, diabetes, rheumatoid arthritis, and inflammatory bowel disease.
Animal studies further support the role of diet: mice fed a Western diet rich in palmitic acid experienced more than 40% increased oral bone loss, while mice fed a Mediterranean diet rich in oleic acid showed reduced bone loss, improved gut microbial balance, and improved stress responses in bone precursor cells.
“Reducing the intake of pro-inflammatory foods and adopting a Mediterranean diet may prevent periodontal disease,” Nibali says, but he notes that larger, controlled studies are needed.
The researchers plan to expand their study to larger populations using metabolomics and metagenomics, and explore intermittent fasting-like diets.
The study highlights growing evidence of a link between diet, inflammation and oral health, suggesting that lifestyle choices may play a key role in maintaining healthy gums.
