In his book Healthy in Seven Days, Dr. Raimund von Helden examines the use of Vitamin D to treat many illnesses. The MANOS concept (Muscles, Adynamia, Nervous system, Orthostasis, Skeletal damage) covers the main symptoms of acute vitamin D deficiency. The book contains many informative case studies, showing how these complaints and illnesses can be permanently remedied by eliminating the cause. Vitamin D deficiency is a widespread issue nowadays, and one of the main causes of disease in many patients. Science has shown that an optimum vitamin D level is over 40 ng/ml. The risk of infections, heart disease and cancer drops significantly in this range, while life expectancy increases. Anyone wanting to regain health, joie de vivre and creativeness, and maintain these in old age, should heed the information presented in this book. William B. Grant, Ph.D. – San Francisco, June 2011 Author of of more than 180 scientific articles on vitamin D, and the founding director of the Sunlight, Nutrition And Health Research Center – www.sunarc.org