After years of research, Dr. William G. Crook discovered that sugar and yeast, along with other foods and chemicals to which people can develop sensitivities, are major dietary culprits and can cause everything from headaches to chronic fatigue syndrome. He, also, found a connection between fatigue and certain nutrient deficiencies. With this information in mind, the doctor developed a diet and vitamin plan that can eliminate fatigue and related symptoms. TIRED SO TIRED! presents the doctor's treatment programme as well as his research on this important subject.