Densitometry or DEXA: Will be determined with the patient in supine position with legs straight and feet together, on a standardized examination table from a densitometry device (Lunar Prodigy, Madison, WI, USA). In the initial study enerarán more faces of the different regions that will be copied and transferred to the images of subsequent studies to reduce the variability of successive determinations. There will be performed a body fat measurement, body composition and assessment of bone mineral density by dual absorptiometry technique. There will be performed a total body "scan" (body composition) or focused on lumbar spine (trabecular bone) and proximal third of the femur (cortical bone) for the evaluation in the last two cases of bone mineral density and a possible osteopenia or osteoporosis.