Total weight loss induces the alteration in thyroid function after bariatric surgery.

"Conflict of interest The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest."

"The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This study was supported by the China-Japan Friendship Hospital National High Level Hospital Clinical Research Funding (grant ID: 2023-NHLHCRF-YYPP-TS-02 to HM, and 2023-NHLHCRF-YS-0103 to Hua Meng), National High Level Hospital Clinical Research Funding (grant ID: NO.ZRJY2023-QM15 to YN, and NO.ZRJY2023-QM09 to ZL), and Elite Medical Professionals Project of China-Japan Friendship Hospital (grant ID: NO.ZRJY2023-QM15 to YN, and NO.ZRJY2023-QM09 to ZL)."