Diet Coke
Diet Coke does not use a modified form of the Coca-Cola recipe, but instead an entirely different formula. The controversial New Coke, introduced in 1985, used a version of the Diet Coke recipe that contained high fructose corn syrup and had a slightly different balance of ingredients. In 2004, Coca-Cola introduced Coca-Cola C2, which it claims tastes much closer to Coca-Cola but contains half the carbohydrates. In 2005, the company introduced Coca-Cola Zero (replaced by "Coca-Cola Zero Sugar" in 2017), a sugar-free variation of regular Coca-Cola.
New Coke
Pepsi-Cola took advantage of the situation, running ads in which a first-time Pepsi drinker exclaimed, "Now I know why Coke did it!" Even amidst consumer anger and several Pepsi ads mocking Coca-Cola's debacle, Pepsi actually gained very few long-term converts over Coke's switch, despite a 14% sales increase over the same month the previous year, the largest sales growth in the company's history. Coca-Cola's director of corporate communications, Carlton Curtis, realized over time that consumers were more upset about the withdrawal of the old formula than the taste of the new one.