Phenylalanine: Coke Zero contains the following: Carbonated water, caramel, phosphoric acid, aspartame (which contains phenylalanine). The ammino acid is known to effect your taste. One thought I would have is perhaps you have been eating something more acidic prior to when it taste "funny" as aspartame breaks down easier in an acidic enviroment.
Answered 6/28/2015
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