Memory Loss: Normal Aging or Early Signs of Dementia?

• Dementia is a group of symptoms caused by diseases or conditions that damage brain cells, leading to a decline in memory, thinking, decision making, language, or daily functioning that goes beyond what is expected with normal aging. Dementia is not something everyone must face as they get older. The World Health Organization (WHO) confirms that managing modifiable risk factors, such as through regular exercise, controlling chronic conditions, getting enough sleep, caring for mental health, protecting hearing and vision, and staying socially active, can help lower the risk of dementia and slow brain decline.
• When hearing declines, the brain has to work harder to process sound, which can cause older adults to gradually withdraw from social interaction. The WHO recommends regular hearing checkups and the use of hearing aids to help reduce dementia risk.

Dementia is a group of symptoms resulting from damage to brain cells caused by various underlying conditions,  leading to a decline in memory, thinking, decision making, language, or daily functioning, as well as changes in mood, personality, and behavior (such as agitation, anxiety, or social withdrawal),  beyond what would normally be expected with age.

Alzheimer's disease is the most common cause of dementia, accounting for approximately 60 to 70 percent of all dementia cases.

1. Normal age-related forgetfulness
   • Occasionally misplacing house keys or glasses.
   • Occasionally forgetting unfamiliar names, complex words, or rarely used terms, but usually remembering them later. 
   • Forgetting certain past events, while still remembering important life milestones.
   • Still being able to carry out complex daily tasks normally, such as cooking or paying bills.
2. Warning signs of dementia (should see a doctor)
   • Declining short-term memory: repeatedly forgetting recent events, or asking the same question multiple times within a short period.
   • Confusion about time and place: getting lost in familiar routes or locations, not knowing the date, or losing track of the season.
   • Language difficulties: using words in the wrong context more often, struggling to recall basic words, or having trouble communicating.
   • Reduced planning and decision-making skills: being unable to complete once-familiar tasks, such as making mistakes with a usual recipe, or mismanaging money or bill payments.
   • Changes in personality, mood, or behavior: depression, anxiety, irritability, suspicion, or social withdrawal.

While there is currently no way to prevent dementia with 100 percent certainty, the latest WHO guidelines state that the risk of dementia can be reduced, or its onset delayed, by managing modifiable lifestyle risk factors. Methods include regular exercise, controlling chronic conditions, getting adequate sleep, caring for mental health, addressing hearing and vision loss, and staying socially engaged.

Changes in the brain often begin decades before noticeable memory decline appears. Making lifestyle changes and managing chronic conditions starting in middle age is therefore a critical window for building cognitive reserve (the brain's extra capacity to withstand damage), helping protect brain cells over the long term.

The WHO emphasizes that dementia prevention requires a multidomain intervention approach, meaning multiple risk factors need to be managed together, systematically, throughout life.

Pillar 1: Lifestyle and behavior modifications

1. Regular exercise
   • Helps increase blood flow to the brain, stimulates the production of neuroprotective substances, and reduces inflammation in the blood vessels.
   • General adults should aim for at least 150 minutes per week of moderate-intensity aerobic exercise (such as brisk walking, cycling, or swimming).
   • Older adults should also add muscle strengthening and balance training, such as single-leg standing, sit-to-stand exercises, and balance walking, along with resistance training, at least 2 to 3 days per week, to reduce the risk of falls and head injuries, which are significant risk factors for dementia.
2. Brain stimulation and learning
   • Cognitive stimulation: engaging the brain through new learning and varied activities, such as reading, card games, chess, arts and crafts, trying new recipes, or learning new technology, to stimulate brain activity and strengthen neural connections.
   • Cognitive training: structured, step-by-step training of specific mental skills such as memory, concentration, planning, and problem solving, which can be particularly beneficial for those with mild cognitive impairment (MCI).
3. Regular social engagement
   • Talking with others, meeting friends, volunteering, or participating in group activities can help reduce feelings of isolation, lower the risk of depression, and stimulate brain function through communication.
4. Avoiding smoking and reducing alcohol consumption
   • Quit smoking: smoking damages blood vessels throughout the body and increases the risk of stroke and dementia. Quitting smoking clearly reduces this risk.
   • Avoid or reduce alcohol: the WHO states that there is no amount of alcohol consumption that is considered safe for the brain. Heavy or regular drinking directly damages brain tissue.

Pillar 2: Nutrition and sleep

1. Brain-healthy eating patterns
   • A diet emphasizing natural, whole foods, such as the Mediterranean-style diet or the MIND diet, is recommended. These emphasize leafy green vegetables, berries, whole grains, nuts, and fatty fish (such as mackerel and salmon), along with the use of olive oil.
   • Avoid processed foods, fried foods, sweets, and excessively salty foods, as these may increase the risk of high blood pressure, diabetes, high cholesterol, and vascular disease.
2. Vitamin supplements
   • There is currently insufficient medical evidence to confirm that taking vitamin B, vitamin E, omega-3, or multivitamin supplements can help prevent dementia or Alzheimer's disease in people with normal vitamin levels.
   • Therefore, taking vitamin supplements specifically for dementia prevention is not recommended. Instead, focus on getting complete nutrition from natural food sources such as vegetables, fruits, nuts, and fish (unless a vitamin deficiency has been diagnosed and a doctor recommends supplementation as appropriate).
3. Quality sleep and rest
   • Sleep is the time when the brain clears waste products and residual proteins, such as amyloid-beta, from the brain.
   • Aim for sufficient quality sleep—typically 7–9 hours for younger adults and 6–8 hours for older adults. Focus on waking up feeling refreshed rather than strictly tracking hours. 
   • If you experience loud snoring, waking suddenly at night, waking up feeling unrefreshed, or unusual daytime sleepiness, a sleep study (sleep test) is recommended to identify the cause, particularly obstructive sleep apnea.

Pillar 3: Managing underlying health conditions and sensory health

1. Controlling blood pressure, diabetes, and cholesterol
   • High blood pressure, diabetes, and high LDL cholesterol can cause blood vessels in the brain to narrow, harden, or rupture, leading to vascular dementia.
   • Regular health check-ups are recommended to keep blood pressure, HbA1c (average blood sugar level), and cholesterol within normal ranges.
2. Maintaining a healthy weight in middle age
   • Abdominal obesity in middle age can contribute to chronic inflammation and metabolic dysfunction, which increase the risk of heart disease, vascular disease, and dementia. Maintaining a healthy weight, body mass index (BMI), and waist circumference is therefore important.
3. Caring for hearing and vision
   • Hearing: when hearing declines, the brain must work harder to process sound, which can lead older adults to withdraw from social interaction. The WHO recommends regular hearing check-ups and the use of hearing aids to help reduce dementia risk.
   • Vision: regular eye exams and treatment of eye conditions that may affect vision, such as cataracts, glaucoma, or diabetic retinopathy, can help support daily activities and social participation.

Pillar 4: Reducing exposure to air pollution

1. Outdoor air pollution
   Research confirms that fine particulate matter (PM2.5) can pass through the respiratory system into the bloodstream and brain, causing neuroinflammation. Wearing protective masks or using air purifiers when pollution levels are high is recommended.
2. Indoor air pollution
   ​​​​​​​Avoid exposure to smoke from cooking with biomass fuel, incense smoke, or cigarette smoke inside the home.