Treatment is either tablets or insulin to control blood sugar levels along with life style modifications (Diet + exercise).
The primary test used to diagnose both type 1 and type 2 diabetes is known as the A1C, or glycated hemoglobin, test.
With time, raised blood sugar levels can damage the blood vessels and nerves that control the heart. Additionally, people with diabetes are also more likely to have other conditions that raise the risk for heart disease such as high blood pressure and deranged cholesterol or triglyceride levels.
Each person's story and journey of handling diabetes is different. One thing which is mostly common is that with good diet, lifestyle changes, exercise and medications, most patients could lead almost a healthy lifestyle.
There's no particular timeline that stands true for all patients, it depends on many factors such as age of diabetes onset, control of blood sugars, lifestyle and regular check ups.