meat and veggies. Eat only meat or fish or cheese or eggs or poultry and low starch veggies, drink only water. In other words avoid all carbs, carbs will only briefly raise your sugar levels, then Insulin levels and then your sugar will drop again. The fats in the meat or fish or cheese or eggs or poultry will act like a "log on your metabolic fire" to keep your blood sugar stable for hours, without raising insuli.
What not to eat. An easier way to answer the question is by keeping in mind the foods you cannot or should not eat. Stay away fro foods with excess carbohydrates. Are you ready? Potato chips, cupcakes, twinkies, pizza crust, cereal, fritos, pretzels, cheetos, Are you getting the idea?