People with prediabetes who took part in a lifestyle intervention that provided individualized support for weight management, more healthful eating, and increased physical activity lowered their blood glucose levels by 15 mg/dL on average, according to results from a large UK study that included more than 2 million participants. Prediabetes is defined by blood glucose levels between 100 to 125 mg/dL—higher than normal but still below the cutoff for type 2 diabetes.