Vitamin D deficiency is the most common medical condition in the world. In the US alone, over 200 million people lack sufficient levels of vitamin D and may consequently suffer from chronic health conditions, ranging from daily annoyances like fatigue and pain to life-threatening illnesses such as diabetes, heart disease, and cancer. But few people know why vitamin D is so important and what they can do to avoid the myriad ailments associated with deficiency. Michael Holick is the father of modern vitamin D research. With more than three decades spent studying the relationship between vitamin D, limited sun exposure, and human well-being, Dr Holick shares his findings on how combining the natural curative properties of the sun along with small lifestyle changes can help everyone live a substantially healthier life. Dr Holick provides prescriptive advice for anyone - from relatively healthy people to those suffering from chronic or even fatal diseases - on how to easily rebuild and maintain optimal levels of this essential hormone. Rich with anecdotes and entertaining case studies, The Vitamin D Solution also presents research from around the world to serve as a wake-up call on this potentially life-saving hormone for health.