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Aspartame in diet sodas will naturally break down over time, especially if stored in higher temperatures, and in both diet and regular sodas the carbon dioxide will produce further carbonic acid (incidentally making itself flat), but aside from a change in flavour, the beverage is likely to be completely safe to drink -- and will probably still taste good.
It would take a very, very long time for the flavour to be affected enough to be completely unacceptable -- and even then it would still be safe. Even if all of the remaining carbon dioxide has broken down into sour acid (which would take years in an unopened can), it's still far more dilute and less acidic than your stomach acid, assuming you can handle the terrible flavour.
Soda is usually consumed well before this becomes a problem, of course.
One caution should be made: any sodas that contain real fruit juice, like orange soda, grape soda, etc., should be viewed as potentially unsafe after their expiration. They can mould or ferment rapidly once the container is opened, in the case of aluminum cans, and glass or plastic bottles which have less perfect seals should be viewed as unsafe even before opening. Of course, in all cases, this fermentation would be minimal, primarily affecting flavour and safety: it would not produce any meaningful amount of alcohol (so don't bother trying it at home ;-)).
nothing will happen it will only get flat .
i did it but with one which is 7 months expired
6/17/2010 CORRECTION by Nightlisa:
I actually opened a Diet Coke yesterday which was almost 2 years expired, and the carbonation was the opposite of flat, it was super fizzy!
I submitted this question to the Coca Cola company via their website, because it tasted as if the sweeteners had faded away. In summary, while it may not taste so great, it is SAFE to drink. So if you find the taste palatable, drink away!
Below I have included the response from Coca-Cola.
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From: cocacolasupport@na.ko.com
Reply to: coca-cola.support@na.ko.com
Date: Thu, Jun 17, 2010 at 5:51 AM
Subject RE: Coca-Cola Web Form
Thank you for contacting The Coca-Cola Company. We appreciate your interest in our brands.
The date on the packaging is the "Optimum Taste Date." This is the date by which we recommend you consume the beverage in order to enjoy the optimum taste. The complete date code is located on the bottom of cans and on the neck of bottles. Since there is nothing in our sparkling soft drink brands that should spoil, we expect that our soft drink brands are safe to consume beyond the date.
We hope this information is helpful. Should you have additional questions or comments, please feel free to contact us again.
Robin
Industry and Consumer Affairs
The Coca-Cola Company
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So i drank a soda just awhile ago that expired on 1-3-11. Its 1-29-11 and my stomach feels weird/and hurting now. Its been like MONTHS since ive had... i just found it in my room. So i learned a GOOD lesson. never to drink soda that has been ALREADY EXPIRED.
- NOPE. It has to be something else you ate. Already been mentioned in post above that expired soda does NOT make you sick.
I just drank Bottle of coke expired July 2010 and it is Feb 2015. Only difference is it was totally flat, and flavor was disappering. otherwise it was good.
What else can I help you with?
When did my passport expire, considering it has been 20 years since it last expired?
If your passport expired 20 years ago, it means it expired in the year 2001.
When did my passport expire, considering it has been 10 years since it expired?
If your passport expired 10 years ago, it likely expired in the year that is 10 years before the current year.
What happens if you drink a coca cola that has been expired for over 8 years It is kept in an american glass bottle and has never been opened or attempted to be opened?
If you drink a coca cola that has been expired for over 8 years that is kept in an American glass bottle and has never been opened or attempted to be opened likely nothing negative will happen; it will just taste very bad.
Can I renew my passport if it expired 20 years ago?
No, you cannot renew a passport that has been expired for 20 years. You will need to apply for a new passport.
Can I renew my passport if it expired 10 years ago?
No, you cannot renew a passport that has been expired for 10 years. You will need to apply for a new passport instead.
How long has King Abdullah the second been in power for?
Fifteen Years
Your husband has been here for 8 years he came here legally but his papers have expired you have been married for 5 years now is there anything you can do now?
get his papers signed again because if his papers have expired he is no longer legal. nicole
What happens if youre caught with a expired inspection?
It depends when it expired. If it expired not too long ago, the police will usually remind you and to do it as soon as possible and let you off with a warning. If it has been a long time, you have the possibility of getting arrested.
What are the requirements to renew a gun licence in the US that been expired 3 years ago?
Requirements will very from state to state. In general, ANY license expired for 3 years will require reapplying as if for a new license.
What if your husband been with you for fifteen years and now he dont want to be in a relationship?
Get counseling. Failing that, get a lawyer.
What is the warranty on a 1998 Mazda Millenia S catalytic converter?
8 years/80k Expired unless this has been parked for a few years
What would happen if you take topamax after it expired?
Nothing, I have been taking Topamax that is is 6 months expired. Nothing happens. I would like to know if it become less effective. But I have not been able to get this answer from anybody. The medication seems to be working just fine for my seizures. When I stopped taking my medication about 10 months ago, I had a series of grand mal seizures. But for me no medication has been able to stop my seizures. I have had them for about 8 years now.
