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.
Your digestive tract works hard to convert carbs into glucose, which is the simplest form of carbohydrate. Not only is glucose vital to powering every single cell in your body, it is the only type of fuel that your brain can use.Almost all foods in your diet contain some type of carbohydrate, however, meat, eggs and some types of seafood are the only foods that do not have carbs.eans and Lentils. Beans and lentils are often considered carbs and should be avoided if you are following a strict low-carb diet or monitoring your carbohydrate intake.