....how do you prevent this unpredictable disease????...

Well its genetic as well as it depends on your lifestyle especially your eating habits. I acquired it because my father had it but then I attribute it with my eating habits that is why I had it early compared with my father. How do you avoid it, for me its simple eating healthy foods avoiding toomuch sweets in your regular diet. Avoid getting overweight and keeping a close watch on your cholesterol and all of those things that may trigger and affect your heart is also important. My father had high BP and heart problem before acquiring diabetes so I think avoiding those diseases may also put diabetes at bay and never enter your life at all.