By itself,<unk>  appears to have little impact on health.<unk>  such as club soda or sparkling water is defined in US law as a food of minimal nutritional value, even if minerals, vitamins, or artificial sweeteners have been added to it.<unk>  may increase irritable bowel syndrome symptoms of bloating and gas due to the release of carbon dioxide in the digestive tract. It does not appear to have an effect on gastroesophageal reflux disease. There is tentative evidence that<unk>  may help with constipation among people who have had a stroke. A 2002 study found that<unk>  improved both indigestion and constipation compared to tap water." A 2004 study states that consumers of<unk>  prepared at home had significantly higher mean drinking water intake (tap + bottled +<unk>  in percentage of total water intake than non-consumers, and lower mean intakes of milk, bottled water and tap water, respectively. A 2006 study attempted to find a correlation between consumption of<unk>  and lower bone mineral density, but found no such correlation. A 2017 rat study found that carbon dioxide in<unk>  beverages induces ghrelin release and increased food consumption implicated in obesity. Acid erosion While<unk>  is somewhat acidic, this acidity can be partially neutralized by saliva. A study found that sparkling mineral water is slightly more erosive to teeth than non-carbonated water but is about 1% as corrosive as soft drinks are. A 2017 study by the American Dental Association showed that it would take over 100 years of daily sparkling water consumption to cause damage to human teeth - a claim that could not apply if there is added sugar or artificial flavorings, which often include citric acid and other fruit acids, predicted to have an impact on human teeth.
Carbonated water
Hydrogen fluoride
Bromide
Saline 
Hydrogen water
Haloalkane
Isothiocyanate
Trihalomethane