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.
Fruits, milk, yogurt and foods and beverages containing added sugar, such as soft drinks, juices and desserts, also contain carbohydrates. Although carbohydrates are omnipresent in the American diet, several food groups contain no or almost no carbohydrates.or example, 1 oz. of raw or roasted almonds contains 6 g of carbohydrates, 1 oz. of walnuts or macadamia nuts provides 4 g of carbohydrates, and 1 oz. of sunflower seeds has 7 g of carbohydrates.