GDF15 and metabolic syndrome: GDF15 levels were higher in MetS persons and were associated with high waist circumference, increased glucose levels, and HDL [59] In our study, GDF15, as expected, correlated with age, but only in the MetS group, and correlated in non-MetS individual with total cholesterol, nonHDL, and LDL; these parameters are associated with the risk of cardiometabolic disorders and inflammation.