Carbonated water is of course, water with carbon dioxide gas dissolved into it. It is one of the main ingredients in sodas, sparkling beverages, and seltzer. The effects of carbonated water have been researched extensively. Mineral water has been concluded to lower LDL (bad) cholesterol and even decrease the intensity of dyspepsia (chronic indigestion) symptoms. It can even help ease cardiovascular symptoms. Blood glucose levels also decrease. This applies to solely carbonated water, not sugary sodas, which would increase blood glucose levels. Contrary to the myth, mineral-rich carbonation evens out the acidity in the body so calcium is not lost from the bones and osteoporosis is actually better prevented. One concern of over consumption of carbonated water was acid reflux. In 2006, the University of Southern Californiaâ€™s Keck School of Medicine showed that 62% of the healthy subjects given carbonated beverages resulted in a weaker lower esophageal sphincter. This lets more stomach acid being backed up in the esophagus, leading to reflux. It is not, however, associated with increased risk of esophageal cancer. In moderation, carbonated water by itself is safe to consume. Vanaman, Bonnie. "Health Effects Of Carbonated Water." Burch, Druin. "The Sceptic: Is Fizzy Water Bad for You? | Environment | The Guardian." Latest News, Comment and Reviews from the Guardian | Guardian.co.uk. Web. 08 June 2011. <http://www.guardian.co.uk/environment/2006/feb/02/water.food>.