Severe Periodontitis May Triple Risk of Gestational Diabetes in Expectant Mothers: Study Finds
China: A recent study published in the Journal of Periodontology has shed new light on the connection between oral health and metabolic disorders during pregnancy.
Researchers led by Jing Cheng from the Department of Stomatology, Zhongnan Hospital of Wuhan University, Wuhan, China, have reported that women with periodontitis face a significantly higher risk of developing gestational diabetes mellitus (GDM), particularly when gum disease is moderate to severe.
The prospective cohort study followed 446 pregnant women with singleton pregnancies between 12 and 20 weeks of gestation to explore how the severity of periodontitis influences the likelihood of GDM. The findings revealed a clear dose–response pattern: as periodontal disease worsened, so did the risk of gestational diabetes.
The key findings of the study were as follows:
- Women with stage I periodontitis had more than twice the odds of developing gestational diabetes mellitus (GDM) compared with those with healthy gums (OR 2.84).
- The risk of GDM was nearly three times higher in women with stages II–IV periodontitis compared to healthy controls (OR 3.00).
- Among women aged 30 years or older, severe periodontitis was associated with almost a fivefold increase in GDM risk (OR 4.78).
- The overall incidence of GDM in the study group was 26.7%.
- GDM rates rose sharply with increasing severity of gum disease—from 17.4% among women with healthy gums to 38.6% among those with advanced periodontitis.
To understand the underlying biological link, the researchers conducted mediation analyses using systemic inflammatory markers, including white blood cell (WBC) count, neutrophils, systemic immune inflammation index (SII), and aggregate index of systemic inflammation (AISI). These markers were found to partially explain the association between severe periodontitis and gestational diabetes, mediating 11–19% of the relationship. This finding supports the hypothesis that inflammation may be the bridge connecting poor oral health and abnormal glucose metabolism during pregnancy.
According to the authors, when the results were stratified by age, the association between gum disease and GDM was evident only in women aged 30 years and above, suggesting that advancing maternal age amplifies the inflammatory and metabolic impact of periodontal disease. No significant relationship was observed in younger women.
According to the researchers, these findings highlight the importance of maintaining good oral hygiene and undergoing regular dental check-ups during pregnancy, particularly for older expectant mothers. They also suggest that systemic inflammation could be a potential therapeutic target in preventing GDM among women with periodontitis.
The study provides compelling evidence that worsening gum disease is closely linked to an increased risk of gestational diabetes, with the relationship largely driven by systemic inflammation.
"The results emphasize the importance of interdisciplinary care—where obstetric and dental health professionals collaborate—to promote better maternal outcomes and reduce pregnancy-related complications associated with both periodontal and metabolic disorders," the authors concluded.
Reference:
Cheng, J., Tao, Y., Gong, Q., Liu, J., Wang, C., Li, Y., Luo, H., Xi, J., Wang, Y., Gao, W., & Cheng, B. Association between periodontitis and gestational diabetes mellitus via systemic inflammation: A prospective cohort study. Journal of Periodontology. https://doi.org/10.1002/jper.70026
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