Thyroid autoimmunity and metabolic syndrome: a nationwide population-based study

Area of Science:

• Endocrinology
• Metabolic Health
• Immunology

Background:

• Thyroid hormone levels are linked to metabolic syndrome (MetS), but the role of thyroid autoimmunity remains unclear.
• This study investigates the association between thyroid autoimmunity and MetS in euthyroid individuals.

Purpose of the Study:

• To examine the relationship between thyroid autoimmunity, specifically anti-thyroid peroxidase antibody (TPOAb) positivity, and the prevalence of metabolic syndrome (MetS).
• To assess the risk of MetS components in euthyroid subjects with and without thyroid autoimmunity.

Main Methods:

• Analysis of 4775 euthyroid participants from the Korea National Health and Nutrition Examination Survey VI (2013-2015).
• Categorization of subjects based on thyroid autoimmunity (TPOAb positivity).
• Logistic regression models were used to estimate odds ratios (ORs) for MetS, adjusting for confounders.

Main Results:

• MetS was diagnosed in 25% of participants, with higher TPOAb levels and positivity in those with MetS.
• TPOAb-positive subjects had a significantly higher prevalence of MetS (33% vs 25%).
• TPOAb positivity was associated with increased risk of abdominal obesity, low HDL cholesterol, and elevated blood pressure, and remained a significant risk factor for MetS after adjustments.

Conclusions:

• Thyroid autoimmunity is significantly associated with metabolic syndrome in euthyroid individuals.
• Further longitudinal research is necessary to establish causality between thyroid autoimmunity and MetS.