50 Fun Facts About Alzheimer's Disease

Roughly what share of dementia cases does Alzheimer's disease account for?

That makes it by far the most common cause of dementia.

After whom is Alzheimer's disease named?

Alois Alzheimer first reported the case publicly in 1906.

Which region of the brain, associated with memory, does the disease target first?

That is why the first symptoms are usually problems with learning and memory.

What two kinds of malformed protein deposit characterise the disease in the cerebral cortex?

Amyloid beta builds up outside cells and tau protein inside them.

Which protein forms the neurofibrillary tangles inside neurons?

The tau hypothesis and the amyloid hypothesis are the two leading explanations of the disease's origin.

Is there a cure for Alzheimer's disease?

Available treatments offer relatively small symptomatic benefits, and caregiving is essentially the treatment.

Roughly how many people worldwide had Alzheimer's disease as of 2020?

Prevalence is projected to triple in the coming decades.

What is the strongest genetic risk factor for the common, sporadic form of Alzheimer's disease?

One copy triples the risk and two copies raise it 15-fold; 40 to 80% of patients carry at least one.

By how much does having two copies of the APOE4 allele raise the risk of the disease?

Heterozygotes with a single copy face about triple the risk.

Mutations in which genes cause early-onset familial Alzheimer's disease?

They account for only 1 to 2 percent of cases, but the inherited form is about 90 percent heritable and progresses fast.

People with Down syndrome develop Alzheimer's pathology by 40 due to an extra copy of which gene?

Trisomy 21 means an extra copy of the amyloid precursor protein gene.

Roughly how heritable is late-onset Alzheimer's disease?

Early-onset disease is even more heritable, at about 90 percent.

Up to what proportion of Alzheimer's cases are early-onset, striking people in their 30s to mid-60s?

Most cases begin after 65, and less than 5 percent of sporadic cases start earlier.

How often does the risk of developing Alzheimer's roughly double after the age of 65?

Incidence rises from 3 to as much as 69 per thousand person-years.

Which sex is more often affected by Alzheimer's disease?

The Framingham study found women have almost twice the lifetime risk, not fully explained by longer lifespans.

What is the median life expectancy after a diagnosis?

Men have a less favourable prognosis even after controlling for age.

Which neurotransmitter is lost through the death of basal forebrain neurons, per the cholinergic hypothesis?

That hypothesis produced the drugs that slow the breakdown of the transmitter in the brain.

Which of these is one of the four cholinesterase-inhibitor drugs used to treat cognitive symptoms?

The others are tacrine, rivastigmine and galantamine.

Memantine, used for moderate to severe Alzheimer's, was first developed as what?

It is a noncompetitive NMDA receptor antagonist with only a small benefit.

Which two monoclonal antibodies against amyloid beta won FDA approval in 2023 and 2024?

Lecanemab was approved in 2023 and donanemab in 2024; as of 2025 their role remains uncertain because of side effects, efficacy questions and cost.

What is the only way to definitively diagnose Alzheimer's disease?

Imaging and fluid biomarkers now allow a diagnosis of probable Alzheimer's during life.

How many years before clinical diagnosis can detailed neuropsychological testing reveal mild deficits?

By the time symptoms appear the degenerative process has been under way for many years.

Into how many stages is the course of Alzheimer's disease generally described?

Early or mild, middle or moderate, and late or severe.

Which symptom is described as the most persistent throughout the course of the disease?

About 30 percent of patients also develop delusional misidentifications.

What is the term for the worsening of confusion and agitation in the late afternoon and evening?

Wandering, irritability and emotional lability are common in the middle stage too.

What name was given to the patient in whom Alois Alzheimer identified the first case in 1901?

He followed her case until she died in 1906, then reported on it publicly.

What phrase did the first patient keep repeating when she could not finish writing her name?

Ich habe mich verloren; Alzheimer had asked her many questions and then asked them again to test her memory.

In which German city was the asylum where the first patient was treated?

Alzheimer struck a deal to pay for her care in return for her records and brain after death.

Which psychiatrist, Alzheimer's mentor, first named the disease after him?

He put it in the eighth edition of his Textbook of Psychiatry in 1910 as presenile dementia.

Which staining method did Alzheimer use with two Italian physicians to identify plaques and tangles?

American Solomon Carter Fuller had given a similar report five months earlier.

In which Bavarian town was Alois Alzheimer born in 1864?

He died of heart failure at 51 in Breslau, now Wroclaw in Poland.

After a 1977 conference, which two categories of dementia were concluded to be almost identical?

That is when the disease's name stopped meaning only the early-onset form.

Which US president announced his Alzheimer's diagnosis in a handwritten letter in November 1994?

He died of pneumonia complicated by the disease in June 2004.

Which 2001 film, based on John Bayley's memoir of his novelist wife, portrays her decline?

The Notebook, from Nicholas Sparks's 1996 novel, followed in 2004.

What is the estimated global annual cost of Alzheimer's disease?

It is projected to rise nearly tenfold to about US$9.1 trillion within a few decades.

Where does Alzheimer's and related dementias rank among causes of death worldwide?

In 2022 and 2023 it was the leading cause of death in England and Wales.

Which West African people do not show the usual link between APOE4 dose and Alzheimer's incidence?

Nigerian Yoruba are a notable exception to a relationship seen in other populations.

A 2008 APP mutation that speeds amyloid oligomerisation without forming plaques is named after which city?

It suggests oligomers rather than fibrils may be what causes the damage.

How much sleep a night has become a suggested lifestyle intervention against Alzheimer's?

Clearance of toxic amyloid beta appears to be more active during sleep.

Which aerobic routine is cited as improving memory and cognitive function?

Reading, crosswords and chess are also reported as potentially preventive.

By what year is the number of people with the disease projected to roughly triple?

The projection is 152 million cases, up from about 50 million in 2020.

Who rediscovered the first patient's medical records in 1996?

Later DNA work on her samples reported a PSEN1 mutation, though a 2014 study could not replicate it.

Which 2014 film starring Julianne Moore portrays a Columbia professor with early-onset Alzheimer's?

It was based on Lisa Genova's 2007 novel; Away from Her adapted Alice Munro's story 'The Bear Came over the Mountain'.

Which American artist drew self-portraits from 1995 to 2000 to show his Alzheimer's through art?

English musician the Caretaker portrayed the disease's progression across the album series Everywhere at the End of Time.

The MIND diet, studied for cognitive protection, combines elements of the Mediterranean diet and which other?

Large studies have not shown an independent role for most individual dietary components.

Which company makes the first FDA-approved blood test (2025) for early detection of Alzheimer's plaques?

The Lumipulse G test measures the pTau217 to beta-amyloid 1-42 ratio in adults aged 55 and over with symptoms.

In 2022 and 2023, dementia was the leading cause of death in which part of the UK?

Nearly a million people in the UK were living with dementia in 2024, expected to reach 1.4 million by 2040.

What was the estimated US prevalence of Alzheimer's dementia among people over 85 in 2020?

Prevalence was 5.3% for ages 60–74 and 13.8% for 74–84.

What do the letters of the 'VIPS' dementia framework, shown to cut hours of restraint, stand for?

The American Academy of Family Physicians discourages physical restraints altogether.

Which cognitive screening tools are commonly used to aid Alzheimer's diagnosis?

They can miss mild impairment, so blood, thyroid and B12 tests plus MRI or CT scans help rule out other causes.