Gokosmanoglu F, et al. - In this prospective study, researchers compared pre- and post-bariatric surgery thyroid function tests and thyroid ultrasonography parameters in order to assess changes in thyroid hormones and morphology with weight loss after bariatric surgery in obese patients. They included 472 patients in the study with a mean weight loss of 30.7 ± 5.1 kg after surgery. As per findings, obesity leads to development of thyroid hormone resistance through a mechanism similar to insulin resistance and results in an increase in TSH similar to hyperinsulinemia. Findings indicate an increase in echogenicity at thyroid ultrasonography in line with weight loss following bariatric surgery.