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.
The following are allowable foods on the Induction Phase of the Atkins Diet. For foods with carbohydrate, limit total intake to 20 grams of net carbs. Most protein foods, such as meat, seafood, and eggs, have little or no carbohydrate. However, there are some things to watch out for. Check out these tips on protein foods on a low-carb diet for details. The bulk of the carbohydrate in the diet comes from vegetables. It is important to know the carbohydrate counts of the vegetables you are eating. Twelve to 15 grams per day (not counting fiber) should come from vegetables.