"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," said Elaine Yu, endocrinologist at Massachusetts General Hospital, Boston in US.
"Therefore, bone health may need to be monitored in patients undergoing bariatric surgery," she added. For the study, researchers measured bone density using three-dimensional computed tomography (CT) called quantitative CT.
They compared bone density at the lower spine and the hip in 50 very obese adults. Two years later, bone density was five to seven percent lower at the spine and seven to 10 percent lower at the hip in the surgical group compared with the non-surgical control group.
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