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.
In addition to meats, some condiments and seasonings also have no carbs: 1  Various oils such as olive oil, avocado oil, grapeseed oil, soybean oil, corn oil, peanut oil, safflower oil, sunflower oil. 2  Vinegar. 3  Whole olives. 4  Salt. Ground cinnamon.  Many hot 1  sauces. Mixed seasonings, such as Mrs. 2  Dash. Yellow mustard.