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.
Other foods that contain no carbohydrates are butter, margarine, oils, coffee and tea, mayonnaise, mustard, diet sodas, some whipped creams and some alcohol such as gin, vodka, rum and whiskey. You should not begin a no-carbohydrate or low-carbohydrate diet without your doctor's advice.