Is seltzer as healthy as plain water?!

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Fizzy water is identical to tap water for all practical purposes. Different sparkling waters have different mineral contents, though, so it's hard to generalize on whether they are better or worse. On the one hand, minerals are usually a good thing, but things like high sodium chloride (salt) content aren't always beneficial to health.

As long as it is natural and unsweetened it is.

http://healthyliving.caplar.com

Not generally. Seltzer water often has sodium and the bubbles can cause gas and bloating. Plain water is just pure h2o