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What item you use frequently would you be least surprised to learn is secretly bad for you?
(lemmy.dbzer0.com)
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I bet you're right. If you leave a plastic bottle in the sun, the water tastes god-awful.
It doesn't even have to change temperature, it is enough that the water remains in the bottle for few days for plastic to start "decomposing" (probably not the correct word for it). And by the time you buy the bottle, it has been long since it was filled in the first place.
Oh, and the expiration date on the water bottles? Obviously it's not the water getting stale. It's for the plastic.