GPT and diabetes mellitus: The main analysis is as follows: (1) Males and overweight/obese people generally have higher ALT levels (45, 46) and lower HDL-C levels than females and non-obese people (47–50); from a numerical analysis, higher ALT or lower HDL-C means that the ALT/HDL-C ratio will increase; Judging from the results, an elevated ALT/HDL-C ratio corresponded to a heightened risk of diabetes in males and overweight/obese people.