<prompt> Osteoporosis is characterized by-Increased serum alkaline phosphataseDecreased bone densityWasting of musclesLoosers zone seen  <response>: Osteoporosis is characterized by an abnormally low bone mass and defects in bone structure, a combination of which renders the bone unusually fragile and at greater than normal risk of fracture. Osteoporosis means porous bones, causes bones to become weak and brittle -- so brittle - that even mild stresses like bending over, lifting a vacuum cleaner or coughing can cause a fracture. In most cases, bones weaken when low levels of calcium, phosphorus and other minerals in the bones and results as low bone density. A common result of osteoporosis is fractures of the spine, hip or wrist. Although it;s often thought of as a women;s disease, osteoporosis also affects many men. SYMPTOMS Back pain, which can be severe if fractured or collapsed veebra_ Loss of height over time, with an accompanying stooped posture Fracture of the veebrae, wrists, hips or other bones Ref: Maheshwari 9ththe p.308 