A person with diabetes uses a glucose monitoring system in Berkeley, Calif., Aug. 23, 2025. People with prediabetes who get their blood sugar under control may cut their risk of death from heart disease or heart failure by half, according to new research. (Rachel Bujalski/The New York Times) By NINA AGRAWAL People with prediabetes who get their blood sugar under control may cut their risk of death from heart disease or heart failure by half, according to new research. Prediabetes, which is...