The Short Version
The evidence supports the core point that Coca-Cola’s ingredients each have functional roles in the drink. Manufacturer ingredient disclosures and independent chemistry references align on major functions such as sweetness, acidity, aroma/flavor, bitterness, color, and mouthfeel. The main caveat is that the exact composition of the proprietary “natural flavors” blend is not public, though its role as a flavor/aroma contributor is well established.