Part 12
Protecting Your Brain
Picture a retired teacher of 74 who has started repeating her stories. Her children assume it is Alzheimer’s and quietly begin to grieve. Her doctor finds a vitamin B12 level near the floor, a nightly sleeping pill, untreated hearing loss, and a thyroid that has slowed. Six months later she is herself again. Not every failing memory is dementia, and not every dementia is beyond influence. Of everything my patients fear, this is first. It deserves a clear head.
Clinical scenes in this edition are explicitly labeled illustrations. They describe imagined situations used to explain medical decisions, not documented patients, diagnoses, conversations, or treatment outcomes. They should not be read as evidence that a particular intervention works. Personal recollections are recollections, not medical records.
Evidence grade (draft mapping). 16 questions; a question with mixed evidence counts under each grade.
- 160. What is the difference between normal forgetfulness and dementia?Normal aging slows recall. Dementia takes away the ability to function.EEstablished clinical knowledge
- 161. Are Alzheimer’s and dementia the same thing?No. Dementia is the general term. Alzheimer’s is the most common cause, responsible for about 60 to 70 percent of cases.EEstablished clinical knowledge
- 162. Can dementia be prevented?Risk can be reduced, and some dementia may be delayed. A major model links about 45 percent of cases to potentially modifiable factors; it does not show that a program will prevent 45 percent of an individual’s risk.CObservational
- 163. Is there proof that changing my lifestyle protects my thinking?Yes. Two large randomized trials have now shown it.ARobust human trials
- 164. How much does blood pressure matter for the brain?A great deal. Treating blood pressure firmly in midlife is one of the best-proven ways to protect memory.Grade pending
- 165. Do hearing aids and eyeglasses really protect the brain?Probably. In the higher-risk group of a major trial, treating hearing loss slowed mental decline by nearly half over three years, though the effect across all participants was not statistically significant. Cataract surgery has been linked to about 30 percent lower dementia risk.CObservational
- 166. I carry the APOE4 gene. What now?Your risk of Alzheimer’s is higher, not certain. Everything in this book matters more for you, not less.CObservational
- 167. Is there a blood test for Alzheimer’s?Yes. Three have been cleared by the FDA since 2025. They are meant for people who already have memory symptoms, not for screening healthy people.RRegulatory status
- 168. Do the new Alzheimer’s drugs work?They slow decline modestly in early disease. They do not stop or reverse it, and they carry real risks.ARobust human trials
- 169. I heard that Ozempic or lithium might prevent Alzheimer’s. True?Not proven, and for one of them the major trial was negative.DPreclinical / mechanisticFNot demonstrated / insufficient
- 170. Do brain supplements work?Most do not have convincing evidence for preventing dementia. Correcting a documented deficiency is a different and important task.BLimited or small human studies
- 171. Do brain games work?Brain games mostly make you better at brain games. Real-world challenge works better.BLimited or small human studies
- 172. How do sleep and alcohol affect the brain?Sleep supports brain function, and heavier alcohol use can damage it. Research on sleep-dependent waste clearance is still developing. Chronic short sleep and regular drinking both raise dementia risk.CObservational
- 173. Why do more women than men get Alzheimer’s?About two-thirds of people with Alzheimer’s are women. Longer life explains part of it. The loss of estrogen at menopause may explain more.CObservational
- 174. What treatable conditions can look like dementia?Many. Every person with new memory trouble deserves a search for them before anyone says the word Alzheimer’s.EEstablished clinical knowledge
- 175. When should I see a doctor about my memory?When it is changing, when others notice, or when it affects daily tasks.GGuideline-based / consensus