To spot foods that may be an issue for you, keep track of what you eat in a log alongside of your glucose levels. After a while, you'll be able to notice the effect that certain foods have on you. This is a much better way to spot problematic foods than an elimination diet, and can also show you what foods benefit your health.
To decrease your risk of developing diabetes, quit smoking. Smoking raises your blood-glucose levels, which significantly increases your risk of developing type 2 diabetes. Quitting smoking can lead to weight gain, which also increases your diabetes risk, but diet and exercise is an easy way to tackle that issue. Anyone with a family history of diabetes should be sure not to smoke.