Xandria Williams, ND, is an expert in the fields of biochemistry, human metabolism, nutrition, naturopathy, herbal medicine, homoeopathy, and psychotherapy. She has been a practicing naturopath for 30 years, specializing in cancer for most of the past decade. Williams has been head of the Nutrition and Biochemistry departments at several colleges in Australia and the UK and has appeared frequently on radio and television. She has written 20 books and more than 400 articles on health care.