Dr Megan A. Arroll is a Senior Lecturer in Health Psychology at BPP University and is a Chartered Psychologist and Chartered Scientist with a keen interest in women's health throughout the lifespan. She is the author of Chronic Fatigue Syndrome: What You Need to Know about CFS/ME and co-author of Invisible Illnesses: Coping with Misunderstood Conditions and Irritable Bowel Syndrome: Navigating Your Way to Recovery with Prof. Christine Dancey. Megan splits her time between London and rural Alabama. Liz Efiong has an honours degree in Nutritional Therapy and worked with Patrick Holford as a researcher and writer for two years. She is co-author of Say No to Cancer and has researched and edited a number of other books, including Say No to Arthritis and Balance Your Hormones. Liz is based in London.