We clearly indicate the amount of caffeine in our drinks on our website and provide an online calculator to give you an idea of the amount you are consuming. The amount of caffeine in food and drink does vary, whether that be chocolate, coffee or soft drinks. 'There are slightly different amounts of caffeine in different brands to contribute to their distinct flavour profiles. The amount of caffeine found in our colas is relatively small - about 30mg of caffeine per 330ml serving,' they said. 'Caffeine is used to enhance the flavor of certain carbonated drinks, including Coca-Cola, and adds a slightly bitter taste which helps create a pleasant overal flavor in drinks. Pepsi also had more caffeine, with the respective per liter caffeine scores for Diet and regular versions 135mg (44.55mg/330ml can) and 122mg, which led the paper to criticize big soda for implying that diet versions are healthier.Īsked if health-conscious consumers didn't prefer less rather than more caffeine, a Coca-Cola spokesperson sent us the following statement. These found that samples of Diet Coke contained 139mg of caffeine/liter compared to 109mg in regular Coke 46mg per can versus 36mg.

The paper said it funded lab tests to examine caffeine levels in popular sodas and found slightly higher levels in Diet Coke compared with Red Coke.

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Coke zero vs diet coke caffeine content