This parameter has been further studied, showing that those men and women in the lowest quartile of the IGF-1/IGFBP3 ratio are threefold more likely to meet the Adult Treatment Panel III (ATP-III) definition for MetS, and twice as likely to be insulin resistant—that IGF-1/IGFBP-3 ratio decreases notably as the number of MetS components increases [217]. This evidence concerns the gene IGF1 and metabolic syndrome.