For diet, whole grains, fresh fruits and vegetables, lean meats and poultry, Stay away from the white stuff, white bread, potato’s, sugar, white rice etc. Eat as little processed food as possible . All carbs are not created equal a white potato and a sweet potato have the same carbs but metabolize differently, check out the Glycemic Index on foods it will give you more info. Exercise, weight is a big part of it also. If it runs in your family, I don’t know if you can prevent it, but maybe you can delay it. The closer to nature the food is the better. Read labels and don’t go by net carbs unless your on Adkins. STAY AWAY FROM JUNK FOOD! I hope this helps.