I used to drink cubes of Pepsi per week...like over 20 years ago. My explanation is that it contains aluminum ions (or some other chemical hint) from the tearin

I used to drink cubes of Pepsi per week...like over 20 years ago. My explanation is that it contains aluminum ions (or some other chemical hint) from the tearing of the tab. This is why it tastes better on the earlier sips. If you leave soda out and it gets flat, the small difference is still there for at least half the can. Ultimately, since aluminum is a neurotoxin, it's probably very bad for you over time. Fountain soda is noticeably different.