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Assessing the causal relationship between obesity and hypothyroidism using Mendelian randomization
Summary
This study suggests obesity may cause hypothyroidism. Key risk factors for subclinical hypothyroidism in obese patients include age and lower FT4 levels, aiding early diagnosis.
Area of Science:
- Endocrinology
- Metabolic Disorders
- Genetics
Background:
- Obesity is a global health concern.
- Hypothyroidism, particularly subclinical hypothyroidism (SCH), can impact metabolic health.
- The causal link between obesity and hypothyroidism requires further investigation.
Purpose of the Study:
- To investigate the causal relationship between obesity and hypothyroidism using Mendelian randomization.
- To identify risk factors for SCH in obese individuals.
- To assess the predictive value of FT4 levels for SCH in obesity.
Main Methods:
- Mendelian randomization analysis with five methods (MR Egger, Weighted Median, IVW, Simple Mode, Weighted Mode).
- Analysis of clinical data from 308 obese patients.
- Univariate and multivariate logistic regression to identify risk factors.
Main Results:
- A significant association between obesity and hypothyroidism was observed.
- SCH patients exhibited higher age, TSH, and autoantibody positivity, with lower T4/FT4 levels.
- Age, FT4, thyroid autoantibodies (TPO-Ab, Tg-Ab) were identified as risk factors for SCH.
Conclusions:
- Obesity may have a causal effect on hypothyroidism.
- FT4 levels demonstrated significant predictive value for SCH in obese patients (AUC=0.632).
- Identifying risk factors like FT4 can support early diagnosis and prevention of SCH in obesity.
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