HPED 2507 Lecture Notes - Lecture 18: Bone Density, Osteoporosis, Electrolyte
6 Oct 2016
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Elements and cannot be created or destroyed (can leach out of foods) Old protein matrix is replaced and demineralized. Insufficient calcium to incorporate into matrix = osteoporosis. Disease characterized by low bone mass and deterioration of bone tissue. Increased bone fragility and risk of fracture (broken bones), particularly of the hip, spine and wrist. 1. 4 million canadians (1 in 4 women; 1 in 8 men over 50yrs) Bones develop and mineralize until ~ 30 yrs. Higher peak bones mass reduces the risk of osteoporosis. Bones demineralize with increasing age (by 70 yrs females have lost 30-40% of bone density) Loss can be slowed by a diet high in calcium along with sufficient physical activity. 1200mg/d + 400-800 iu vit d (over 50yrs) Fluid milk and cheese ~50% of the calcium in the diet of adults 18-65 yrs. Calcium absorption: is enhanced by vit d increases with need increases as dietary calcium decreases loss of calcium via the kidneys is reduced.
