Weight loss surgery may increase fracture risk

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Weight loss surgery may increase fracture risk


Certain types of weight loss surgery may weaken bones, increasing the risk of fractures, according to a study from Taiwan.
Weight loss procedures like gastric bypass help obese patients lose weight by reducing the amount of food the body takes in. But many nutrients are also lost when patients undergo these surgeries, senior study author Dr. Kuo-Chin Huang of the College of Medicine at National Taiwan University in Taipei told Reuters Health.
“The commonly lost nutrients are vitamin D and calcium, which are related to the development of osteoporosis,” Huang said by email. “And maybe there are other mechanisms associated with the development of fracture.”
In the last decade, the use of bariatric surgery has increased seven-fold, Huang and his colleagues write in the journal Medicine, online December 15. Past research has already suggested that the procedure brings an increased risk of bone fractures, they note.
In a national insurance database, the study team identified 2,064 patients who underwent bariatric surgery between 2001 and 2009, and compared them with 5,027 similarly obese patients who did not have the surgeries.
Overall, people who had weight loss surgery had a 21% higher risk of breaking a bone in the next five years.
But the added risk was most pronounced among people who underwent malabsorptive procedures such as gastric bypass. They were 47% more likely to experience a fracture during 12 years of follow-up compared to those who did not have surgery.
Bariatric surgeries can reduce and reverse diseases such as type 2 diabetes and hypertension, Huang said. “Therefore, the benefits should outweigh the potential risks if people know how to prevent or decrease the fracture risk.” Duffy said that patients who lose 100 or 200 pounds of weight can also lose diabetes and high blood pressure, and life expectancies in younger patients increase, which is a huge benefit.
The first thing surgical patients should do is take nutrients like vitamin D and calcium supplements, he said.
“Second, sun exposure and exercise can help them from risk for osteoporosis,” Huang said. “Lastly, they should perform some balance training to prevent falls.”
Duffy noted that the fracture increases seen in the study group were mostly in the long bones of the arms and legs, rather than hip or spinal fractures and other types of breaks more typical of osteoporosis.
If you lose 150 pounds, he said, you are going to lose some bone along with some muscle.
“You obviously don’t want it to be a pathologic thing that’s going to set you up for fractures, which is what this paper in particular is addressing,” he said.
Duffy said that at Yale, and most other programs, doctors do full lab panels to look for vitamin and mineral deficiencies and have their patients take supplements before and after their procedures.
SOURCE: http://bit.ly/1Qx7WFx
Medicine 2015.

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