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.
Fortunately, there are foods in most food groups that do not contain carbs. This makes it relatively easy to get a variety of foods when you are on a no carb diet. Some examples of foods that do not contain carbohydrates include: 1  Meat. 2  High in protein and vitamins, most meats do not contain any carbs. 3  This includes beef, pork, veal, duck, goose, chicken and turkey.