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.
Organ meats, such as brains, liver and kidney, are also free of carbs as are fish, crab, lobster, shrimp, mussels, clams, oysters and eggs. Processed meats, such as bacon, ham, sausage and frankfurters, contain low levels of carbohydrates because of the seasoning blends and solutions added to the meat. According to LoveToKnow, oils from avocado, canola, grapeseed, olive, safflower and other vegetables and nuts contain no carbs. Other types of oils that do not have carbohydrates include fish oils, lard and other forms of animal fats.