A substance, both a hormone and neurotransmitter, secreted by the adrenal medulla and the nerve endings of the sympathetic nervous system to cause vasoconstriction and increases in heart rate, blood pressure, and the sugar level of the blood. Also called levarterenol, noradrenalin. norepinephrine.
Foods that only contain protein, fat or both -- and are carb-free -- are few and far between. Most foods contain at least some carbohydrates. However, plant-based oils, other pure fats -- like butter and margarine -- meats, poultry, seafood and eggs are the best sources of carb-free foods.
One carbohydrate exchange equals 15 grams of carbohydrates. Free Foods These are foods that you can eat without counting. A free food or drink is one that contains less than 20 calories and 5 grams or less of carbohydrates per serving. If your serving of a food contains more than 5 grams of carbohydrates, you should count it in your meal plan.