Fatigue is the number-one complaint that doctors hear from their patients, but it is often dismissed as psychological. In the early 1980s, Dr. William G. Crook treated a 35-year-old woman diagnosed with chronic fatigue syndrome (CFS). He created a successful treatment program for her that combined a sugar-free diet with oral antiyeast medications. Further research confirmed that sugar and yeast, along with other food and chemical sensitivities, are a major culprit in everything from headaches to anxiety to CFS and related problems. Tired – So Tired presents the doctor’s program and additional research in lay terms.