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There have been theories about this over the years, as I understand it, it goes something like this. When carbon dioxide enters the blood stream, it turns into carbonic acid, which can lower the pH of the blood.(acidosis) To compensate for this calcium is leeched off your bones, or intercepted on the way to your bones by the carbonic acid. Phosphorous has been suggested as a culprit too, if there is too much phosphoric acid in your diet and not enough calcium the balance is tipped towards phosphorous and this can lead to decrease in bone density over time. Caffeine has been mentioned too as is causes kidneys to pull in sodium from the bloodstream, but because of the biochemistry this also means calcium ions are pulled in too. Another point to ponder s that people who drink excessive amount of fizzy drinks have a diet low in nutrients. But essentially unless you are drinking litres a day and have a good diet then there isn't much to worry about