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Open AccessArticle

Effect of Weight Loss after Bariatric Surgery on Thyroid-Stimulating Hormone Levels in Euthyroid Patients with Morbid Obesity

1
Endocrine, Nutritional and Metabolic Diseases Group, Faculty of Health Sciences, University of A Coruña, 15006 A Coruña, Spain
2
Instituto de Investigación Biomedica (INIBIC), University Hospital A Coruña, 15006 A Coruña, Spain
3
Department of Endocrinology, University Hospital A Coruña, 15006 A Coruña, Spain
4
Clinical Epidemiology and Biostatistics Unit, University Hospital A Coruña, 15006 A Coruña, Spain
5
Department of Digestive and General Surgery, University Hospital A Coruña, 15006 A Coruña, Spain
*
Authors to whom correspondence should be addressed.
Nutrients 2019, 11(5), 1121; https://doi.org/10.3390/nu11051121
Received: 26 April 2019 / Revised: 10 May 2019 / Accepted: 16 May 2019 / Published: 20 May 2019
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Abstract

Obesity is associated with several endocrine abnormalities, including thyroid dysfunction. The objective of this study was to investigate the effect of weight loss after bariatric surgery on thyroid-stimulating hormone (TSH) levels in euthyroid patients with morbid obesity. We performed an observational study, evaluating patients with morbid obesity submitted to bariatric surgery. We included 129 patients (92 women) and 31 controls (21 women). Clinical, anthropometric, biochemical, and hormonal parameters were evaluated. The primary endpoint was circulating TSH (µU/mL). Fasting TSH levels were higher in the obese group (3.3 ± 0.2) than in the control group (2.1 ± 0.2). The mean excessive body mass index (BMI) loss (EBMIL) 12 months after bariatric surgery was 72.7 ± 2.1%. TSH levels significantly decreased in the obese patients after surgery; 3.3 ± 0.2 vs. 2.1 ± 0.2 before and 12 months after surgery, respectively. Free thyroxine (T4) (ng/dL) levels significantly decreased in the obese patients after surgery; 1.47 ± 0.02 vs. 1.12 ± 0.02 before and 12 months after surgery, respectively. TSH decreased significantly over time, and the decrement was associated with the EBMIL. In euthyroid patients with morbid obesity, weight loss induced by bariatric surgery promotes a significant decline of the increased TSH levels. This decrement of TSH is progressive over time after surgery and significantly associated with excess BMI loss. View Full-Text
Keywords: obesity; weight loss; bariatric surgery; thyroid; TSH obesity; weight loss; bariatric surgery; thyroid; TSH
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Juiz-Valiña, P.; Outeiriño-Blanco, E.; Pértega, S.; Varela-Rodriguez, B.M.; García-Brao, M.J.; Mena, E.; Pena-Bello, L.; Cordido, M.; Sangiao-Alvarellos, S.; Cordido, F. Effect of Weight Loss after Bariatric Surgery on Thyroid-Stimulating Hormone Levels in Euthyroid Patients with Morbid Obesity. Nutrients 2019, 11, 1121.

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