What happens to soda that has been expired for fifteen years?

Flat and flavorless: Expired soda loses its carbonation and becomes flat. The flavors and sweeteners also degrade over time, resulting in a bland and unappetizing taste.

Chemical changes: The chemical composition of soda changes over time. The carbon dioxide gas escapes, causing the soda to go flat. The sugar molecules break down and can form compounds like furfural and hydroxymethylfurfural (HMF), which give expired soda a stale or caramel-like flavor. Other flavoring agents and additives can also degrade and contribute to the undesirable taste.

Potential for contamination: Expired soda can become contaminated with bacteria and other microorganisms. This contamination can occur through improper storage conditions or damage to the packaging. Consuming contaminated soda can pose a health risk and may cause foodborne illnesses.

Color changes: The color of expired soda may change over time due to the degradation of ingredients. Some sodas may darken in color, while others may become cloudy or develop sediment. These changes are usually harmless but indicate the deterioration of the product.

Best to discard: It is generally recommended to discard expired soda to ensure safety and quality. Consuming expired soda may not cause immediate harm, but it is not advisable as it can have an unpleasant taste and may pose a potential health risk due to contamination or changes in its chemical composition.