Will I get Alzheimers? probably....

My father, and both of my paternal grandparents, had Alzheimers, so the odds that I and/or my siblings will also suffer from this disease is high.  In fact, I already have some symptoms, so was intrigued to learn today that the latest research has shown that poor diet and lack of exercise may play a major part in getting Alzheimers.  I find this too much of a generalisation, because my grandfather was an orchardist in the Adelaide Hills, so got lots of exercise and grew all their own fruit and vegetables.  My father, after leaving the hills, was a dairy farmer.  He also grew all our own fruit and vegetables and played sport nearly all his life. OK my life may be more sedentary and my eating habits could be better, but I would think genetics, not lifestyle will be my main determinator.