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.
According to LoveToKnow, some of the foods that do not contain carbohydrates include naturally-occurring meats, oils, animal fats and salt. Butter is the only dairy product that does not contain any carbohydrates. LoveToKnow explains that naturally-occurring meats, such as beef, chicken, turkey, duck, goose and lamb, do not contain carbs.