Non-Insulin-Based Insulin Resistance Indices and Localized Periodontitis in Physically Active Young Male Adults: CHIEF Oral Health Study

Aims: This study aims to examine the association between non-insulin-based insulin resistance indices and periodontitis severity in young males. Background: Periodontitis has been reported with an association with insulin resistance in middle- and old-aged adults. Objective: The association between insulin resistance and localized periodontitis in young adults is unclear. Methods: A total of non-diabetic 1,111 military males in Taiwan were included in this study. Localized periodontitis was classified as healthy (N =665), stage I (N =130), stage II (N =161), and stage III (N =155) based on the world workshop in 2017. Insulin resistance was assessed by serum triglycerides concentrations, the triglycerides glucose (TyG) index, the product of serum triglycerides and fasting glucose, and the ratio of serum triglycerides to high-density lipoprotein cholesterol (TG/HDL-C). Multiple logistic regression analysis with adjustment for age, tobacco smoking, alcohol intake, abdominal obesity, and hypertension was used to determine the associations. Results: Serum TG concentrations, TyG index, and TG/HDL-C ratio were dose-dependently associated with a greater risk of localized periodontitis severity (from stage I to stage III) [odds ratios and 95% confidence intervals: 1.001 (0.999-1.004), 1.003 (1.001-1.004) and 1.003 (1.002- 1.005) for TG; 1.45 (1.03-2.03), 1.65 (1.22-2.22) and 1.66 (1.22-2.26) for TyG index; 1.06 (0.99- 1.14), 1.09 (1.03-1.15) and 1.10 (1.04-1.16) for TG/HDL-C ratio]. However, the association was only found in obese individuals and those free of impaired fasting glucose. Conclusion: The present study confirmed that periodontitis may lead to insulin resistance in young male adults, particularly for those with obesity and without hyperglycemia. The TyG index is suggestive as the strongest indicator for the association between insulin resistance and periodontitis in young adults.