Vitamin D--from the sun, from our diet, and from dietary supplements--keeps a range of chronic and life-threatening diseases at bay, from osteoporosis and osteoarthritis to cancer of the breast, prostate, and colon; diabetes; multiple sclerosis; asthma; cystic fibrosis; Crohn's disease; scleroderma; rickets; cardiovascular disease; and many others. This wide-ranging volume spotlights the latest research into how and why this much-maligned and misunderstood vitamin is finally coming into its own, and how to gain the greatest benefits from it. Among the facts you'll learn.