How did we get so tired? -- The physiology of fatigue -- The intricate interplay of hormones -- Sex and fatigue -- Do you have a sugar disease? -- Playing diet detective: are the foods you choose making you tired? -- The inner environment: toxins within -- Environmental poisons: your world can make you sick and tired -- Molds, mites, and pollens: common causes of allergic fatigue -- Sleep and relaxation: recharging your batteries -- Exercise: jump-starting your batteries -- The depression connection: how to find out if masked depression is making you tired -- Chronic fatigue syndrome: the twentieth-century plague? -- Surviving success: maintaining high energy levels.