coke shortens life?

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i love coke . ive been drinking coke since i was a little girl . its as if i cant live a day without drinking coke. but last year i got an email from a friend that says too much drinking of coke is not good for everyone's health. it says on the email that there was an experiment done with a piece of nail placed in a glass poured with a bottle of coke. after 24 hours,the nail was gone, it dissolved! since then i stopped drinking any kind of soda. but there are days that i cant really help but want to have a bottle of coke...