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Insulin resistance is a hallmark of type 2 diabetes and is observed in various clinical and experimental conditions, yet its underlying mechanisms remain unclear. This study explores whether different triggers of insulin resistance share a common pathway. Using a genomic approach, researchers analyzed two cellular models of insulin resistance induced by tumor necrosis factor-alpha (TNF-α) and the glucocorticoid dexamethasone. Both models exhibited increased levels of reactive oxygen species (ROS), confirmed by cellular redox state measurements. While ROS have been implicated in insulin resistance, direct evidence of their causality has been limited. Through six different interventions—including small molecules and transgenes—aimed at reducing ROS levels, the study demonstrated a partial reversal of insulin resistance in vitro. Furthermore, one of these treatments improved insulin sensitivity and glucose homeostasis in obese, insulin-resistant mice. These findings suggest that elevated ROS levels serve as a common mediator of insulin resistance across different pathological contexts, highlighting oxidative stress as a potential therapeutic target for metabolic disorders.