In meta-analysis of RCTs and based on evidence of moderate certainty, physical activity in comparison to control intervention was associated with: (i) better glucose homeostasis profile [WMD of glucose, insulin and Assessment of Insulin Resistance (HOMA-IR) were − 3.26 mg/dl (95% CI − 5.12 to − 1.39), − 3.19 μU/ml (95% CI − 3.96 to − 2.43)] and − 0.47 (95% CI − 0.60 to − 0.35), respectively], and (ii) improved cardiorespiratory fitness [WMD of relative and absolute oxygen uptake relative (VO2) were 4.53 ml/kg/min (95% CI 3.11, 5.96) and 0.26 L/min (95% CI 0.21, 0.32) respectively]. This evidence concerns the gene INS and Insulin resistance.