The World Health Organization (WHO) has confirmed its recommended intake of aspartame, but its classification of the sweetener as a potential carcinogen may impact diet soda sales and prompt new beverage formulas. Diet sodas now make up over a quarter of sales in the soda segment, with zero-sugar versions of Coca-Cola and PepsiCo being successful bets for both companies. The International Agency for Research on Cancer, a WHO agency, has identified a possible link between aspartame and liver cancer, prompting manufacturers to consider removing the sweetener from their products.