How Many Calories Does a Big Mac Have?

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A McDonald's burger.
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The Big Mac is one of the flagship sandwiches offered by the fast food chain McDonald's. After cooking, a Big Mac serving size is approximately 7.5 oz or 214 g.

Calories

One Big Mac sandwich contains 540 calories; 260 of the calories come from fat. Though the sandwich's caloric content is hefty for one meal item, the burger provides 25 percent of your daily needs for iron and also contains 25 g of protein, according to McDonald's nutritional information.

Ingredients and Allergens

A Big Mac contains beef, processed cheese food, pickle, onions, a "special sauce," the content of which is not defined in McDonald's online nutritional information, lettuce and a bun. Potential allergens in this entree include wheat and possibly milk products.

Considerations

The Big Mac provides a big dose of both fat and sodium for just one sandwich, at 29 g of fat -- 45 percent of your daily fat recommendations -- and 1,040 mg of sodium per burger. The National Heart Lung and Blood Institute recommends consuming no more than 2,400 mg of sodium in your entire day's worth of foods.

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