The Big Mac is one of McDonald's most iconic meals. It has been on the menu since 1967. It also known for being worth a whopping 540 calories, but anyone looking to cut down on their caloric intake should actually be weary in turning to fast food salads. According to Business Insider, "Adding things like bacon, cheese, and of course, creamy dressings can really make the calories add up. And although calories aren't an exact indicator of an item's "healthiness.