Colas and controversies have always co-existed. It was colas as contraceptive in late sixties and now it is pesticides in colas in India. The link between obesity and colas is another concern which is controversial.

The sale of colas in the west has gone down in contrast to developing countries. Colas are the only beverages, which are sold without declaring all of their contents. This makes it difficult to assess the total impact of colas on health including carcinogenicity.