Others found significant inverse associations between 25(OH)D and MetS [17], fasting glucose [17,18,40], fasting insulin [18,40,42], Homeostasis Model Assessment (HOMA)-IR [40,42], HOMA-B [40], triglycerides [17,18], waist circumference [17], blood pressure [17], and positive association with HDL cholesterol in Chinese adults [17,18]. This evidence concerns the gene INS and metabolic syndrome.