Treatment of morbid obesity can reduce elevations in the TSH level caused by the overactivation of the thyroid axis, in turn due to various pathophysiological processes and endocrine adaptations [45]. Studies have reported that ghrelin levels decrease following LSG and Roux-en-Y gastric bypass, whereas they remain unchanged after laparoscopic adjustable gastric banding [46]. Here, GHRL is linked to morbid obesity.