Is seltzer water healthy? Separating fact from fizz
                                
                                
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                                    4 min read                                
                            
                                According to nutrition experts, plain seltzer water is just as hydrating as still water and a far healthier alternative to sugary sodas. But as its popularity soars, so do the questions about whether is seltzer water healthy, or if its fizz hides any downsides.