Association Between Metabolic Syndrome, Its Components, and Periodontal Disease in U.S. Adults: Analysis of NHANES 2011–2014

This study evaluated the association between periodontal disease and metabolic syndrome (MetS), examining the independent and combined effects of its five diagnostic components on periodontal disease prevalence.

This cross-sectional analysis utilized data from the 2011–2012 and 2013–2014 survey cycles of the National Health and Nutrition Examination Survey (NHANES). These represent the most recent NHANES cycles that included a full-mouth clinical periodontal examination of adults. Participants were adults aged ≥30 years with complete laboratory measurements for MetS and clinical periodontal assessments. Descriptive statistics were used to summarize the characteristics of the study population, including weighted prevalence estimates and p-values for demographic, behavioral, and inflammatory variables, and periodontal disease. Univariable and multivariable logistic regression analyses were conducted to examine the association between periodontal disease and MetS, as well as MetS components analyzed both individually and collectively.

A total of 3,368 participants met the inclusion criteria for this study. Among them, 34.88% (1,175 participants) had MetS. The groups most affected by MetS were participants aged 70 and older (44.33%), those with the lowest education level (40.13%), low-income level (38.46%), smokers and former smokers (36.80% and 37.12% respectively), high White Blood Cell (WBC) counts (51.72%), and those with periodontal disease (36.46%). In crude analysis, MetS was significantly associated with periodontal disease (cOR = 1.29; 95% CI: 1.02-1.62). However, when adjusting for confounding factors, the association was not statistically significant (aOR = 0.85; 95% CI: 0.63-1.14) even when comparing the participants who had all five MetS components to those with no MetS (aOR=0.82, 95% CI: 0.35-1.92). Similar results were found when assessing the association between severe periodontal disease and MetS. Elevated fasting glucose was the only MetS component that had a statistically significant association with periodontal disease (aOR = 1.29; 95% CI: 1.04-1.60).

The findings align with several prior studies reporting null associations, while inconsistencies in the literature may be attributable to differences in populations, diagnostic criteria, confounder control, and sample size. Despite limitations related to the cross-sectional design and NHANES data, this study is strengthened by its large, nationally representative sample and objectively measured periodontal and MetS variables. Overall, the findings suggest that shared socioeconomic and behavioral factors, rather than a direct biological relationship, may underlie the observed patterns, highlighting the need for longitudinal research and targeted interventions to address health disparities.

While periodontal disease and MetS share similar risk factors, this study found no significant association between the two after adjusting for confounders. These findings emphasize the role of socioeconomic and behavioral factors in improving both conditions. Future longitudinal studies are needed to explore potential causal relationships and focus on mitigating health disparities through targeted interventions.