Regarded as the most effective treatment for severe obesity, bariatric surgery may lead to bone loss for at least two years even after the body weight stabilizes.

Endocrinologist at Massachusetts General Hospital, Boston in the US Elaine Yu says the long term consequences of this substantial bone loss are unclear but it might put them at increased risk of fracture or breaking a bone.

For the study, they compared bone density at the lower spine and the hip in 50 very obese adults. Two years later, bone density was 5-7 percent lower at the spine and 7-10 percent lower at the hip in the surgical group compared with the non-surgical control group.

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