Why does bone mineral density decline after bariatric surgery, specifically Roux-en-Y gastric bypass, despite calcium and vitamin D supplementation?

💡 Explanation

Bone mineral density declines because Roux-en-Y gastric bypass can cause malabsorption of minerals like calcium, even with supplementation; this limits the available mineral to rebuild bone via the bone remodeling process. Therefore, bone density decreases, rather than from hormone level changes or muscle adaptations.

• A researcher investigates osteoarthritis progression by analyzing synovial fluid samples. If IL-1β cytokine levels are chronically elevated, which effect dominates cartilage degradation?
• Why does cancer treatment that targets growth factor receptors sometimes fail to induce apoptosis in tumor cells despite initial inhibition of cell division?
• A neurologist observes that a patient's action potential propagation velocity is significantly reduced despite normal ion channel function. Which mechanism explains this phenomenon?
• Why does the small intestine, with its relatively short length compared to the colon, perform the majority of nutrient absorption in the digestive system?
• In a dehydrated patient, what happens to urine production because of vasopressin's influence on aquaporins?
• Why does elevated estrogen during the menstrual cycle typically promote follicle maturation, rather than follicular atresia, despite both processes using similar receptors?