Drinking cola has been linked with osteoporosis in women. A new study has found that women who drink caffeinated cola are at greater risk of suffering fractures or developing brittle bone disease.
The caffeine in cola is responsible for removing calcium from the body, so decaffeinated drinks do not have the same effect.
Previously, researchers had believed that the connection between fizzy drinks and bone weaknesses, which has become evident in recent years, was due to acids which are added to carbonated drinks. Others have blamed artificial sweeteners, or the fact that people who drink many fizzy drinks are unlikely to be drinking enough milk.
Dr Robert Heaney and Dr Karen Rafferty of the Creighton University Osteoporosis Research Centre in the United States, examined the effects of seven drinks, including cola water and milk on women's bones. They found that cola which contained caffeine caused the body to excrete significantly more calcium than normal.
"Though the caffeine in the cola drinks was primarily responsible for small but significant increases in excess calcium excretion, the main cause of calcium loss from other carbonated beverages was their lack of the nutrients needed for bone health", according to the researchers.
So still not sure why fizzy drinks are worse than non fizzy/non juice drinks