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.
1 Salmon, halibut, trout, mackerel, and sardines are great for a no carb diet because they are high in protein but low in carbs and fats. 2  Vegetables. 3  Many vegetables do contain carbohydrates but many of the leafy green vegetables (spinach, lettuce, celery, kale, and turnip greens) are great choices for the no carb diet.