Carbonated water is merely water with carbonation added and is just as hydrating as water without carbonation.
More Info: Many carbonated beverages, such as sodas, beer, and tonic water typically have added sodium, sugar, and calories. As an example one energy drink contains nearly two tablespoons of sugar and three times the amount of caffeine than a can of cola. Seltzer water, or purely carbonated water, usually has no other added ingredients. The carbonation process does not alter the water in such a way that hydration does not occur. Therefore, drinking carbonated water can hydrate you.
Fact: Any beverage with caffeine acts as a diuretic and causes the body to become depleted of water stores. Carbonated water with added caffeine will therefore produce a dehydrating effect.
Fact: Proper hydration is vital to maintaining good health. Without enough water, body systems will fail and eventually shut down. Many people rely on thirst as a prompting mechanism to drink, however, once a person becomes thirsty, dehydration may have already begun.
Fact: It is important to sip water throughout the day, as the human body needs a steady supply of water at all times. Don’t overdo it. Drinking too much water, though difficult to do, is dangerous and even lethal.
Fact: Signs of dehydration include lightheadedness, dizziness, and fatigue. Dehydration can range from mild to severe and is best avoided by staying continually hydrated. Carrying a water bottle at all times can help to develop the habit of taking in plenty of water throughout the entire day.
Consumption of soft drinks has a dramatic effect on individual health habits. Soft drink consumers were found to have a higher energy intake and body weight and were less likely to choose beverages containing higher nutrient counts such as milk.
American Journal of Public Health
In an interesting study, placing a free water cooler next to soda for sale did not impact the soda sales or encourage water consumption.
Journal of Obesity Facts
Drinking a sodium-rich carbonated mineral water could reduce the risk of cardiovascular risk in post-menopausal women.
Journal of Nutrition
Perryman, Shirley, MS, and RD. “Cool Tips for Summer Drinks.” Colorado State University Extension. N.p., n.d. Web. 4 June 2010. http://www.ext.colostate.edu/pubs/columnnn/nn080717.html.
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“Water and Hydration.” The University of Arizona Campus Health Service Home. N.p., n.d. Web. 4 June 2010. <http://www.health.arizona.edu/health_topics/nutrition/general/waterhydration
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“The Hazards of Too Much Water – Harvard Health Publications.” Health Information and Medical Information – Harvard Health Publications. N.p., n.d. Web. 4 June 2010. http://www.health.harvard.edu/press_releases/the-hazards-of-too-much-water.