Vitamin D deficiency has been receiving a deluge of media coverage lately, and physicians are likely to hear many related questions from patients, especially long-term care residents and their families. What are the latest developments in vitamin D research, and how can adequate vitamin D levels help prevent falls among our older patients? Even more fundamentally, how do we define vitamin D insufficiency and deficiency? Dr. Bruce Troen, professor of medicine, research scientist at the Geriatric Research, Education, and Clinical Center, and director of the molecular gerontology program at the University of Miami Miller School of Medicine in Miami, Florida, describes the crucial role that vitamin D plays throughout the body, beyond its well-known role in the musculoskeletal system. How common is vitamin D insufficiency among geriatric and nursing home residents? What is the best regimen and dosage to overcome vitamin D insufficiency or deficiency? When should calcium be supplemented to help prevent fractures? Tune in to hear host Dr. Eric Tangalos and this week's guest sift through the latest information on vitamin D.