Soft drink consumption has been shown to be a cause of insulin resistance and weight gain. This relates to the high sugar (sucrose) content of most soft drinks. Caffeine is also added to soft drinks (approximately 70 % in the United States) and this is justified by manufacturers for flavour reasons. However, this assertion is contentious because studies do not support the role of caffeine as a flavouring agent. In fact, in one study, researchers investigated the claim that caffeine could be used as a flavouring agent. In this regard the authors asked subjects to state a preference for a number of caffeinated and non-caffeinated cola beverages. The results of the study showed that only 8 % of subjects could differentiate between the taste of caffeinated and non-caffeinated drinks, suggesting that the claim that caffeine was added as a flavouring agent was likely exaggerated by the manufacturers. It is likely the real reason that caffeine is added to soft drinks is because of its energy providing and addictive properties.
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