Diet Coke
Diet Coke (called Coca-Cola Light in some countries) is a sugar-free and no-calorie soft drink produced and distributed by The Coca-Cola Company. It contains artificial sweeteners instead of sugar. Unveiled on July 8, 1982 and introduced in the United States on August 9, it was the first new brand since 1886 to use the Coca-Cola trademark. The product quickly overtook the company's existing diet cola, Tab, in sales.
New Coke
Some Coca-Cola executives had quietly been arguing for a reintroduction of the old formula as early as May. By mid June, when soft drink sales usually start to rise, the numbers showed that new Coke was leveling among consumers. Executives feared social peer pressure was now affecting their bottom line. Some consumers even began trying to obtain "old" Coke from overseas, where the new formula had not yet been introduced, as domestic stocks of the old drink were exhausted. Over the course of the month, Coca-Cola's chemists also quietly reduced the acidity level of the new formula, hoping to assuage complaints about the flavor and allow its sweetness to be better perceived (advertisements pointing to this change were prepared, but never used).