Yes, soda can "go bad," although it's more about a decline in quality than a safety risk, especially if unopened.
Here's a more detailed breakdown:
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Safety vs. Quality: The USDA states that unopened soda past its expiration date is generally safe to drink. The primary concern is the flavor and carbonation degrading over time.
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Expiration Dates: "Expiration date" or "best by" dates on soda cans and bottles are indicators of peak quality, not safety.
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Changes Over Time: Even sealed, soda can undergo changes that affect its taste, fizz, and color:
- Loss of Carbonation: The carbon dioxide that gives soda its fizz can slowly leak out, resulting in a flat taste.
- Flavor Degradation: The artificial sweeteners and flavorings in soda can break down over time, leading to a less appealing or "off" taste. Diet sodas are often more susceptible to flavor changes due to the instability of artificial sweeteners.
- Sediment Formation: In some cases, sediment may form at the bottom of the can or bottle as ingredients precipitate out of solution. This is generally harmless but can affect the appearance and texture.
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Opened Soda: Opened soda will go flat relatively quickly as the carbon dioxide escapes. It is also more susceptible to bacterial contamination. It's best to consume opened soda within a few days to maintain its quality and minimize the risk of spoilage.
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Storage Conditions: Proper storage can extend the shelf life of soda. Store unopened soda in a cool, dark place to minimize changes in flavor and carbonation.
In summary, while drinking expired soda won't typically make you sick if it's been stored properly and remains sealed, it likely won't taste very good. Expect a loss of carbonation and potential changes in flavor.
