A 48-year-old woman is screened at an NPCDCS-supported diabetes clinic in Tamil Nadu. Her fasting blood sugar is 128 mg/dL and 2-hour post-glucose load is 185 mg/dL. She is overweight (BMI 27.5 kg/m²), non-smoker, and has no family history of diabetes. Physical examination is unremarkable. What is the most appropriate next step according to NPCDCS screening and management protocol?