Carbonated water, also known as soda water, sparkling water, fizzy water or seltzer water, is plain water into which carbon dioxide gas has been dissolved. The process of dissolving carbon dioxide gas is called carbonation. It results in the formation of carbonic acid (which has the chemical formula H2CO3).
In the past, soda water was produced in the home by “charging” a refillable seltzer bottle by filling it with water and then adding carbon dioxide. Club soda may be identical to plain carbonated water or it may contain a small amount of table salt, sodium citrate, sodium bicarbonate, potassium bicarbonate, potassium sulfate, or disodium phosphate, depending on the bottler. These additives are included to emulate the slightly salty taste of homemade soda water.

Calcium

What do PMS (Premenopausal Sindrome), colon cancer, high blood pressure and osteoporosis have in common? A secret enemy: low calcium levels. Women have heard for years that adequate calcium intake–from food or supplements–protects bones and delays osteoporosis. Recent research shows that calcium’s value extends to many other functions as well.
A recent study showed that women who took 1,200 mg of calcium per day had far fewer PMS symptoms than those who didn’t. Is PMS a signal to women that they’re not getting enough calcium? In other studies, teenagers with high blood pressure saw big reductions after taking 1500 mg of calcium per day, the equivalent of 5 glasses of skim milk. 2 other studies have shown that improved calcium intake can reduce the growth of precancerous colon polyps.
The more we learn about calcium, the more benefits we discover. Calcium can aid digestion, improve wound healing and blood clotting, and reduce muscle cramps.
Most women must take calcium supplements to meet their recommended daily allowances. Choosing which calcium and how much to take can be confusing.

Carbonated Water and Calcium Absorption

Carbonated beverages (including water) contain phosphorus, which can upset the balance of calcium in the body. Caffeinated colas (such as Coke and Pepsi) tend to be higher in phosphoric acid than clear soft drinks (like 7-Up and Sprite), but both are hard on your bones if your calcium intake is poor.
Caffeine causes you to lose calcium in your urine. Many American women have trouble getting an adequate dietary intake of calcium each day. Drinking soda is also a problem for teenage girls who are still building their bones. Chances are, if they’re drinking soda, then they’re not getting enough milk. Premenopausal women need a daily calcium intake of 1,200 mg per day; menopausal women need a daily calcium intake of 1,500 mg per day.

Sources: Wikipedia, Dr. Donnica, Ask an Expert

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