Lifestyle Modification and Bariatric Surgery in Type 2 Diabetes Remission : Short title: Diabetes Remission Strategies in T2DM.

Type 2 diabetes mellitus (T2DM) has traditionally been regarded as a chronic and progressively worsening disease. This paradigm is now challenged by evidence showing that remission is achievable in selected patients, particularly when interventions produce substantial and sustained weight loss. This narrative review synthesizes current evidence on lifestyle modification and bariatric/metabolic surgery as remission-inducing strategies, with emphasis on mechanisms, comparative efficacy, predictors of response, and limitations. Intensive lifestyle interventions, especially very-low-calorie diets and total diet replacement programs, can induce normoglycemia in selected individuals through reductions in hepatic and pancreatic fat, improved insulin sensitivity, and partial recovery of β-cell function. However, durability is limited and depends strongly on sustained weight loss. Bariatric/metabolic surgery, particularly Roux-en-Y gastric bypass and sleeve gastrectomy, achieves higher and more durable remission rates than non-surgical approaches. These effects are mediated by both weight loss and weight-independent mechanisms, including enhanced incretin signaling, altered bile acid metabolism, and gut microbiota changes. Consistent predictors of remission include shorter diabetes duration, lower baseline HbA1c, reduced treatment burden, greater weight loss, and preserved β-cell function. Despite these advances, relapse remains common, long-term randomized data are limited, and important barriers persist, including procedural risk, cost, and inequitable access. Overall, the evidence supports a shift from a model of inevitable progression toward one of potentially reversible metabolic dysfunction, with important implications for early, remission-oriented care.