Drinking carbonated beverages can cause calcium loss and lead to osteoporosis.
Some observational studies suggest that people who drink carbonated beverages have a higher risk of fractures.
Researchers say it's not the carbonation but the ingredients in the beverage that are responsible...phosphates, caffeine, and sugar.
Caffeine has been implicated alone as a risk factor for osteoporosis. It's theorized that caffeine causes an increase in urinary calcium and may also reduce calcium absorption. But its effects, if any, are minimal. For example, the potential effect from a cup of coffee would be negated by just 1 to 2 tablespoons of milk.