Abbreviations: IVW, inverse variance weighted; OR, odds ratio with 95% confidence intervals; BMI, body mass index; WC, waist circumference; WHR, waist–hip ratio; T2D, type 2 diabetes mellitus; FG, fasting glucose; FI, fasting insulin; HbA1c, glycated haemoglobin; SBP, systolic blood pressure; DBP, diastolic blood pressure. This evidence concerns the gene INS and type 2 diabetes mellitus.