I would suggest you talk to your doctor and specifically tell him/her about your dad’s family history if your doctor is unaware of your family history. Depending on when your blood glucose is taken at the doctor’s office (i.e. either fasting or 2 hours after a meal) will affect the test results. Your blood glucose should be 70 – 105 milligrams per deciliter fasting and it is normal for your fasting blood glucose to double within 2 hours after a meal. However, it should be below 140 milligrams per deciliter two hours after eating. Anything higher should be tested further. Ask your doctor. You should have your blood glucose tested at least once a year as a screening for diabetes considering your family history.
You can’t prevent diabetes completely and research points to causes other than what you eat, but overweight is a risk factor for developing diabetes sooner rather than later. Until more is learned, lose weight and exercise to manage your blood glucose. Control carbohydrates and alcohol to lower your triglycerides.