If your uncle has been newly diagnosed with diabetes, treatment usually starts with lifestyle changes like a healthy low-sugar diet, regular exercise, and weight control. Most doctors also begin with medicines, depending on the patient's blood sugar levels and overall health. Regular sugar monitoring and follow-up with a doctor are important to keep diabetes under control.

HbA1c is a blood test that shows your average blood sugar levels over the past 2–3 months. Doctors use it both to diagnose diabetes and to check how well blood sugar is being managed over time. An HbA1c result of 6.5% or higher, confirmed by repeat testing, indicates diabetes.