As a subject matter expert in food science and safety, I can provide you with information on the shelf life of soda.

Once a bottle or can of soda is sealed, it can last for a very long time without spoiling. The high acidity of the beverage acts as a natural preservative, which means that bacteria and other microorganisms are less likely to grow. However, the quality of the soda can deteriorate over time, which is different from the expiration or spoilage.

Commercially bottled or canned sodas are often good for about one year from the date of bottling or canning. After this period, the taste and carbonation may start to diminish. The expiration date you might see on a soda can or bottle is more about the quality of the taste rather than safety.

Once opened, soda has a much shorter shelf life. It can go flat within a few hours to a couple of days, depending on how well it is sealed after opening.

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The first thing to go bad with any soft drink is the loss of CO2 (the carbon dioxide which makes the soda fizz when you pour a glass). So, it is not harmful to drink soda if the bubbles begin to diminish and then eventually disappear (6-9 months past the best by date), but it will taste flat.read more >>