Soybean products, such as tofu, are also considered a protein food. Since protein foods contain no carbohydrate they do not directly affect blood sugar levels. Foods such as margarine, butter, cream cheese, salad dressings and nuts add calories to a meal. Cutting back fats and oils makes good sense for anyone. Fats and oils do not directly affect blood sugar levels.
Extras add interest to any meal.
Vegetables low in natural sugar such as asparagus, broccoli or rhubarb and small portions of ketchup, relish, cocoa or bran are considered extras when used in limited amounts.