ch. 1. Nature of neurons and their specialized membranes -- ch. 2. DHA contributes both benefits and risks to mammals -- ch. 3. Use it or lose it concept of brain health is linked to DHA -- ch. 4. Evolution and DHA : redefining the DHA principle -- ch. 5. DHA is 'king omega' for maximizing mental speed -- ch. 6. DHA improves energy efficiency in neurons -- ch. 7. Wild conformational dynamics of DHA might save energy by sealing stretch-induced defects as fast as they occur in membranes -- ch. 8. Lipid whisker model and water-wire theory of energy uncoupling in neurons -- ch. 9. Neurons boost their energy state by using powerful antioxidant systems to protect their membranes against damage -- ch. 10. Oxygen-dependent damage (lipid peroxidation) of DHA membranes of neurons is inevitable and requires novel mechanisms for long-term protection -- ch. 11. Revised mitochondrial theory of aging and brain span -- ch. 12. Development of dual energy pacemaker theory of aging : role of the membrane -- ch. 13. Membranes and cancer -- ch. 14. Parkinson's disease -- ch. 15. Prion diseases -- ch. 16. Brain trauma-induced dementia -- ch. 17. Alzheimer's disease.