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.
What Are Negative Results from Eating No Carbs? Red meat is one of the few zero-carb foods. You eat meat, eggs, fish, pure fats and nothing else on a true no-carb diet. Although you lose weight quickly, the absence of any carbs makes the diet monotonous and potentially dangerous.