Abstract
Purpose
The protective effect of onion against thyroid hypofunction has been reported in animal studies. However, in humans, the association between onion consumption and subclinical hypothyroidism (SCH) are unclear. The study sought to explore the association between habitual onion intake and SCH among adult population from an iodine-replete area.
Methods
A cross-sectional study (6515 men and 5290 women) was performed in Tianjin, China. Frequency of onion consumption was assessed using a valid self-administered food frequency questionnaire. Serum free triiodothyronine (FT3), free thyroxine (FT4), and thyroid-stimulating hormone (TSH) were determined by chemiluminescence immunoassay. SCH was diagnosed with TSH > 4.78 mIU/L. Multiple logistic regression was used to evaluate the association of onion intake with SCH.
Results
The prevalence of SCH was 2.56% in men and 7.18% in women, respectively. In women, the fully adjusted odds ratios [95% confidence interval (CI)] of having SCH across increasing frequency of onion intake were 1.00 (reference) for <1 time/week, 0.99 (0.73, 1.34) for 1–3 times/week, 0.74 (0.53, 1.03) for 4–6 times/week, and 0.67 (0.47, 0.97) for ≥7 times/week (P for trend <0.01). However, we observed no significant association between onion intake and SCH in men. Stratified analyses suggested a potential effect modification by age: the odds ratios (95% CI) across extreme quartiles was 0.37 (0.17, 0.80) in <40 women and 1.11 (0.51, 2.47) in >60 women.
Conclusions
Frequent consumption of onion is inversely associated with SCH in adult women from an iodine-replete area. Further studies are needed to explore the casual relationship.
Trial registration website
https://upload.umin.ac.jp/cgi-open-bin/ctr_e/ctr_view.cgi?recptno=R000031137
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Abbreviations
- SCH:
-
subclinical hypothyroidism
- FT3:
-
Serum free triiodothyronine
- FT4:
-
free thyroxine
- TSH:
-
thyroid-stimulating hormone
- CI:
-
confidence interval
- Se:
-
selenium
- SAC:
-
Sallylcysteine
- TCLSIH:
-
Tianjin Chronic Low-grade Systemic Inflammation and Health
- CVD:
-
cardiovascular disease
- FFQ:
-
Food Frequency Questionnaire
- WDRs:
-
weighed dietary records
- WC:
-
waist circumference
- BMI:
-
body mass index
- FBG:
-
fasting blood glucose
- TG:
-
triglycerides
- TC:
-
total cholesterol
- LDL:
-
low-density lipoprotein cholesterol
- HDL:
-
high-density lipoprotein cholesterol
- BP:
-
blood pressure
- SBP:
-
systolic blood pressure
- DBP:
-
diastolic blood pressure
- PA:
-
physical activity
- IPAQ:
-
International Physical Activity Questionnaire
- OR:
-
odds ratio
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Acknowledgements
The authors gratefully acknowledge all the people that have made this study.
Funding
This study was funded by the National Natural Science Foundation of China (Nos. 91746205, 81872611, 81941024 and 81673166), China.
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J.Z. and Y.G. analyzed data and wrote the paper. M.G., Q.Z., L.L., H.W., S.Z., Y.W., T.Z., X.W., X.Z., X.W., S.S., M.Z., Q.J. and K.S. conducted research. K.N. designed research and had primary responsibility for final content. All authors read and approved the final manuscript.
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Zhang, J., Gu, Y., Meng, G. et al. Association between dietary onion intake and subclinical hypothyroidism in adults: a population-based study from an iodine-replete area. Endocrine 74, 616–624 (2021). https://doi.org/10.1007/s12020-021-02790-2
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DOI: https://doi.org/10.1007/s12020-021-02790-2