Can't lose weight no matter how much you exercise? It might be your hormones and sleep cycle working against you. Your circadian rhythm and stress response affect your appetite, metabolism and fat storage.

In this episode of Health Talk, CGTN's Li Dongning speaks with leading endocrinologist Professor Zhao Weigang from Peking Union Medical College Hospital about the link between burnout, late nights and stubborn weight gain. They break down why stress makes you eat more, how long-term phone use may lead to sleep deprivation and whether sleeping pills are a safe fix.

Watch the full interview and check out the science of weight and sleep.

Supervisor: Zhang Jingwen

Producer: Yang Sha

Directors: Du Junzhi, Chai Shouyu

Video Editor: Yan Qiwen

Copy Editors: Joseph Stannard, Chen Chen

Videographers: Bai Nan, Wang Zihao, Tenzin Gyatso

Cover: Pei Zihan