Glycaemic Control and Weight Reduction: A Narrative Review of New Therapies for Type 2 Diabetes

Early and intensive treatment of type 2 diabetes (T2D) has been associated with lower risk of diabetes-related complications. Control of overweight and obesity, which are strongly associated with T2D and many of its complications, is also key in the management of the disease. New therapies allow for individualised glycaemic control targets with greater safety. Thus, in patients with a higher cardiovascular and renal risk profile, current guidelines encourage early treatment with metformin together with glucagon-like peptide-1 receptor agonists (GLP-1 RAs) and sodium-glucose co-transporter-2 inhibitors with proven cardiovascular benefit. GLP-1 RAs combine highly efficacious glucose-lowering activity with a reduced risk of hypoglycaemia. Recently, tirzepatide, a first-in-class drug that activates both glucose-dependent insulinotropic polypeptide and GLP-1 receptors, has demonstrated very high efficacy in glycated haemoglobin (HbA1c) and weight reduction in clinical trials. Tirzepatide has the potential to help people with T2D reach recommended glycaemic and weight targets (HbA1c 5% weight reduction) and to allow some patients to reach HbA1c measurements close to normal physiological levels and substantial weight reduction. In 2022, tirzepatide was approved by the US Food and Drug Administration and the European Medicines Agency for treatment of people with T2D and is currently in development for chronic weight management. Plain Language Summary In people newly diagnosed with type 2 diabetes, early and intensive treatment of the disease can help control blood sugar and reduce the risk of later complications. The need to control weight in people with obesity and diabetes has also recently become a priority. New drugs developed in recent years allow for better and more individualised management of blood sugar without the risk of blood sugar levels dropping too low. In patients at risk of kidney or heart disease, the current recommendation is early treatment with metformin and drugs with proven cardiovascular benefit. Tirzepatide is a new drug that has also demonstrated very high efficacy in reducing blood glucose and body weight. It has the potential to help people with type 2 diabetes achieve their goals and prevent other diabetes-related complications. It is likely that some patients will even be able to bring their blood glucose to normal levels and lose substantial amounts of weight. The US and European regulatory agencies approved tirzepatide in