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.
You can eat most vegetables in relatively unlimited amounts on a low-carbohydrate diet plan. It's best to avoid or minimize starchier vegetables, such as carrots, turnips, beets, peas and corn. Other vegetables, like salad greens, spinach and green onions, also are very low in carbohydrates.