Carbohydrates are a macronutrient that comes in at 4 calories per gram. When they are consumed, they get converted to glucose and used for instant energy or they are stored as glycogen for later use. When you go on a high-protein diet and severely restrict your carbs, your body goes into a state of "ketosis." When this happens, your body shifts from carbs to fat for energy. Foods with no sugar or carbs can be utilized when you are trying to get your body into this state.
Meat
Meat is high in protein and iron, and some forms are high in fat. It is also free of carbs and sugar. Examples include steak, sirloin, beef tips, beef patties, pork, lamb, chicken, turkey, duck, bison, venison and any other game meat. Processed meats like bacon and sausage have a tendency to have minimal carbs due to added sugar and other added ingredients.
Fish
Fish is similar to meat in the fact that it is high in protein and some versions are low in fat. Trout, monkfish, salmon, smelt, snapper, sole, pike, herring, eel and anchovies are all examples of fish that are free of sugar and carbs. Shellfish that fall into this category include shrimp, crab and crayfish. Lobster has just over a gram of carbs. If any type of fish or shellfish was to get prepared with breading, they would no longer be carb free.
Dairy
Dairy products are high in calcium, protein, fat and most of them have moderate amounts of carbs. Whipped butter is the only exception. It has no sugar or carbs. Gruyere cheese and salted butter both have a trace of carbs.
Eggs
Eggs are high in protein, choline, B vitamins, fat and cholesterol. They also have no sugar or carbs. This also goes for egg whites and various preparations such as hard boiled, soft boiled, poached, scrambled and fried.
Oils
Oils are mono or polyunsaturated fats which are healthy fats. They are free of carbs, and they have no sugar. Examples of these are olive oil, canola oil, flax seed oil, sunflower oil, safflower oil and wheat germ oil.
Alcohol
Alcohol has 7 calories per gram, it is low in protein and there are some types that are free of carbs and sugar. Examples of these are gin, whiskey, rum and vodka. White wine has 1g of carbs.
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