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Surgery for Obesity and Related Diseases

Weight-loss surgery linked to lower bone density years later

After stomach-reducing sleeve surgery, upper thigh-bone density fell from 0.99 to 0.49 grams per square centimeter; both gastric bypass groups also showed declines.

Paper by Daniel Moritz Felsenreich, Natalie Vock, Lea Pedarnig, +10 more authorsGerhard Prager · Medical University of Vienna
Figure 1 from Surgery for Obesity and Related Diseases
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Figure 1. Felsenreich et al.

Our read

Interventions
Studied:
Cohort study of 60 patients who underwent weight-loss surgery, mean 10.1 years
What changed:
Upper thigh-bone density fell from 0.99 to 0.49 grams per square centimeter after sleeve surgery; bypass groups also declined
The catch:
Only 60 patients total, with 20 in each surgical procedure
In the record:
The 201st paper on bariatric surgery with results in people; 433 on record in all.
Why it’s aging research:
It bears on staying healthy in midlife and later life.

Editor of record: Boris Djordjevic · AgingResearch.News

Paper
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In an observational cohort study, 60 patients had bone health assessed before weight-loss surgery and an average of 10.1 years later. Researchers combined retrospective records with prospective long-term follow-up. Twenty patients had sleeve gastrectomy, which reduces stomach size. Two other groups of 20 had different types of gastric bypass surgery.

Bone scans showed lower density at the neck of the thigh bone after all three operations. Density in the lower spine did not change significantly. Blood tests related to bone health largely stayed within reference ranges. Vitamin D levels rose after all procedures, reflecting supplementation after surgery. A fracture-risk calculator estimated higher 10-year risks of major osteoporosis-related fractures and hip fractures at follow-up.

Why it matters

Osteoporosis weakens bones, making fracture prevention a concern as people age. The authors supported considering routine bone health monitoring after weight-loss surgery.

Caveats

This observational before-and-after comparison cannot establish that surgery caused the changes. It included 60 patients, and the fracture results were calculated risks, not reported fracture counts.

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