ensity loss because it replaces milk in the diet.
But this study disproved it as those who had lots of cola and those who rarely drank it consumed equal amounts of milk.
She said, "It is not entirely clear why cola reduced bone mineral density. "
Further studies are needed to confirm and explore her findings.
She said, "Women who fancy the odd can of cola need not worry.
"There is no concrete evidence that an occasional cola will harm the bones," she said.
"However, women concerned about osteoporosis may want to steer away from frequent consumption of cola until further studies are conducted."
A spokeswoman for the National Osteoporosis Society said: "What's interesting about this study is that most of the women did seem to be getting a good intake of calcium from other food sources, yet their bone density was affected by drinking as little as four cans of colas a week, which isn't much.
"This study obviously adds to our knowledge but it also makes it clear its results are not definitive and further research is needed.
"However, perhaps women need to think about just how much cola they are drinking and consider mixing their soft drinks.
"Couple this with a healthy, calcium rich diet and taking plenty of weight bearing exercise and they are doing the best they can for their bones."
Approximately 3 million people in the UK suffer from osteoporosis and 50% of women above the age of 50 will suffer a fracture due to this problem. Reduction in bone density due to loss of bone cells leads to the development of osteoporosis. An early menopause, lack of calcium in the diet and eating disorders, increases the risk of developing this ailment. And now, excessive consumption of cola has also become a risk factor.
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