The document summarizes a study that found people who filled 5 or more antibiotic prescriptions during a 12-year period in Denmark had over a 50% increased risk of developing type 2 diabetes. The risks were slightly higher for narrow-spectrum and bactericidal antibiotics. The increased risk may be due to antibiotics disrupting gut bacteria in ways that reduce the body's ability to metabolize sugar, a characteristic of type 2 diabetes. Overuse of antibiotics contributes to antibiotic-resistant bacteria strains that are harder to treat.