Rutgers University Nov 7 2025 A widely prescribed diabetes drug may be sabotaging one of the most trusted strategies for preventing the disease: exercise. That is the conclusion of a Rutgers-led study published in The Journal of Clinical Endocrinology & Metabolism , which found that metformin blunts critical improvements in blood vessel function, fitness and blood sugar control that normally come from working out. Since 2006, doctors have been advised to tell patients with high blood sugar to