Osteoporosis Prevention Are you concerned about your bones? Osteoporosis is a disease of reduced bone mass that can lead to fractures. Approximately 1 in 4 women and 1 in 8 men over the age of 50 has osteoporosis in Canada. Osteoporosis often progresses unnoticed. Warning signs include: Posture deformity “hunch” Loss of height “shrinking” Reduced ability..