It was a natural choice. The fast food giants are tossing artificial ingredients by the end of the year, hoping to boost sales in an increasingly health-conscious marketplace. Nacho and pizza cheeses will lose their yellow No. 6, and the end is nigh for seasoned beef’s fake black pepper flavoring. The plans to alter nearly every menu item have some diners kicking up a fuss, and naturally, the makeover will have little effect on fat content. But others are applauding the change and hope more restaurants follow suit.