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Open AccessArticle

Central Resistance to Thyroid Hormones in Morbidly Obese Subjects Is Reversed after Bariatric Surgery-Induced Weight Loss

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
CICA (Centro de Investigaciones Científicas Avanzadas), As Carballeiras, s/n Campus de, San Vicente de Elviña, 15008 A Coruña, Spain
4
Department of Endocrinology, University Hospital A Coruña, 15006 A Coruña, Spain
5
Clinical Epidemiology and Biostatistics Unit, University Hospital A Coruña, 15006 A Coruña, Spain
6
Department of Digestive and General Surgery, University Hospital A Coruña, 15006 A Coruña, Spain
*
Authors to whom correspondence should be addressed.
Authors contributed equally to this article and share senior authorship.
J. Clin. Med. 2020, 9(2), 359; https://doi.org/10.3390/jcm9020359 (registering DOI)
Received: 28 December 2019 / Revised: 15 January 2020 / Accepted: 21 January 2020 / Published: 28 January 2020
(This article belongs to the Section Endocrinology & Metabolism)
Endocrine abnormalities are common in obesity, including altered thyroid function. The altered thyroid function of obesity may be due to a mild acquired resistance to the thyroid hormone. The aim of this study was to investigate the effect of weight loss after bariatric surgery (BS) on resistance to thyroid hormones in patients with extreme obesity compared with a control group. We performed an observational study evaluating patients with extreme obesity who underwent BS. We included 106 patients (83 women) and 38 controls (24 women). The primary endpoint was the thyrotroph thyroxine resistance index (TT4RI) and thyroid stimulating hormone (TSH) index (TSHRI). The parameters were studied before and after surgery. TSHRI and TT4RI were higher in the obese patients than in the control group. TT4RI and TSHI decreased significantly over time after surgery, with this decrease being associated with the excessive body mass index (BMI) loss and C-reactive protein (CRP). In extreme obesity, BS promotes a significant decrease in the increased TT4RI and TSHI. This decrease of TT4RI and TSHI is progressive over time after BS and significantly associated with excess BMI lost and CRP. Extreme obesity is characterized by a mild reversible central resistance to thyroid hormones. View Full-Text
Keywords: obesity; bariatric surgery; endocrine abnormalities; thyroid hormone resistance obesity; bariatric surgery; endocrine abnormalities; thyroid hormone resistance
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Juiz-Valiña, P.; Cordido, M.; Outeiriño-Blanco, E.; Pértega, S.; Varela-Rodríguez, B.M.; García-Brao, M.J.; Mena, E.; Pena-Bello, L.; Sangiao-Alvarellos, S.; Cordido, F. Central Resistance to Thyroid Hormones in Morbidly Obese Subjects Is Reversed after Bariatric Surgery-Induced Weight Loss. J. Clin. Med. 2020, 9, 359.

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