In 2019, the number of patients with diabetes was about 463 million in the world, accounting for 8.3% of the total population, and it is expected to rise to 578 million (9.2%) by 2030 and 700 million (9.6%) by 2045. According to the WHO diagnostic criteria, the prevalence of diabetes among adults in China from 2015 to 2017 was 11.2%, of which over 90% were type 2 diabetes mellitus (T2DM). The global prevalence of non-alcoholic fatty liver disease (NAFLD) is also very high, which was approximately 25% in 2016. The prevalence of NAFLD may continue to rise. NAFLD is often accompanied by clinical manifestations of metabolic syndrome, such as obesity, T2DM, hyperlipidemia and hypertension.