The Coca-Cola Company said it sees nothing wrong with drinking lots of Diet Coke. "Great taste. No calories. Wholesome ingredients. How could you drink too much?" said Diana Garza, the communications director of Coca-Cola North America.

Although many Americans can't start their day without a cup of coffee or tea, die-hard fans of diet sodas claim there's no substitute.

It's the one addiction people will admit to. But will Diet Coke—now 25 years old—be the same if it comes with vitamins?

Coca-Cola is a cola (a type of carbonated soft drink) sold in stores, restaurants and vending machines in more than 200 countries. It is produced by The Coca-Cola Company and is often referred to simply as Coke. Originally intended as a patent medicine when it was invented in the late 19th century by John Pemberton, Coca-Cola was bought out by businessman Asa Griggs Candler, whose marketing tactics led Coke to its dominance of the world soft drink market throughout the 20th century.The company actually produces concentrate for Coca-Cola, which is then sold to various licensed Coca-Cola bottlers throughout the world. The bottlers, who hold territorially exclusive contracts with the company, produce finished product in cans and bottles from the concentrate in combination with filtered water and sweeteners. The bottlers then sell, distribute and merchandise Coca-Cola in cans and bottles to retail stores and vending machines. Such bottlers include Coca-Cola Enterprises, which is the single largest Coca-Cola bottler in North America, Australia, Asia and Europe. The Coca-Cola Company also sells concentrate for fountain sales to major restaurants and food service distributors.The Coca-Cola Company has, on occasion, introduced other cola drinks under the Coke brand name. The most common of these is Diet Coke, which has become a major diet cola. However, others exist, including Diet Coke Caffeine-Free, Cherry Coke, Coca-Cola Zero, Vanilla Coke and special editions with lemon and with lime, and even with coffee.