The Early Signs of Dementia: The Subtle Shifts Families Notice Before the Individual Does
We’ve all been there: you forget where you put your keys, walk into a room and wonder why you went in, or stare blankly into the open refrigerator trying to remember what you wanted. These experiences are extremely common - especially during periods of stress, fatigue, or heavy workloads - and they do not automatically signal dementia. True warning signs usually look quite different: entire episodes wiped from memory, persistent difficulty with familiar tasks, a noticeable shift in behavior, or a complete lack of awareness that a decline is happening.
Dementia is not a single disease, but an umbrella term describing a group of conditions and syndromes that impair cognitive functions severely enough to interfere with daily life. This impairment can affect memory, language, attention, judgment, visual perception, planning, and the ability to carry out familiar tasks. While Alzheimer’s disease is the most common form, other types include vascular dementia, frontotemporal dementia, and Lewy body dementia - each of which may have a distinct onset.
Not Every Memory Lapse is Dementia
"One of the most prominent signs is short-term memory loss," explains Dr. Inbal Maayan, a senior geriatrician and the Medical Director of Tzabar Health. "However, it is crucial to distinguish: if someone forgets where they left their keys or why they opened the fridge, it is usually not dementia. In dementia, we see entire events completely erased from memory, alongside forgetting objects or places that were once familiar and are no longer recognized."
The vital difference lies not just in the lapse itself, but in its frequency and impact on daily functioning. An individual might momentarily forget an acquaintance’s name and recall it later. In contrast, someone who repeatedly forgets a conversation that just took place, asks the same question within a short timeframe, struggles to navigate familiar surroundings, or fails to perform a routine action needs to be evaluated.
Dementia is not an inevitable part of aging. Early diagnosis can help identify the root cause of the decline, guide appropriate treatments, and help families plan for the future.
When the Personality Begins to Shift
The very first sign isn't always a memory problem. Often, family members are the first to notice a change in behavior or personality. A person who was once calm and gentle may become aggressive, suspicious, or impatient. In other cases, someone who was dominant and active turns apathetic, withdrawn, or passive.
"In any case of behavioral change in older adults - particularly from age 70 and up - it is recommended to seek an evaluation," says Dr. Maayan. "People sometimes tend to attribute such changes to a psychiatric issue, but it is important to rule out an underlying cognitive process."
She emphasizes that family members are frequently the first to notice the shift. While an individual experiencing mild cognitive decline might be aware of the difficulty and even complain about it, dementia can impair a person's ability to recognize their own changes. Recent clinical literature supports this: studies show that neuropsychiatric and behavioral symptoms - such as apathy, depression, irritability, and sleep disturbances - frequently manifest during the earliest stages of cognitive decline, long before severe memory loss takes center stage [PMC4963801, PMC3038531].
"It isn't necessarily denial," Dr. Maayan stresses, "but rather a limitation stemming from the disease itself."
Sharp in the Morning, Confused by Evening
In Lewy body dementia, memory may be relatively preserved in the early stages, while primary impairments appear in other areas. "We may identify difficulties with concentration and attention, a slowing of thought processes, and trouble with planning or executing complex tasks," Dr. Maayan explains.
One hallmark feature is significant fluctuation in functioning and alertness. A person can be sharp, communicative, and fully functioning at one hour, only to appear drowsy, confused, or detached from their surroundings a few hours later. Some patients also experience detailed visual hallucinations, such as seeing people, children, or animals that are not there.
Another potential sign is REM sleep behavior disorder. Under normal conditions, muscles remain relaxed during dreaming, but in this disorder, the person may talk, shout, kick, or make sharp movements as if physically acting out the dream.
The condition may also include Parkinson's-like symptoms, such as movement slowness, muscle rigidity, shuffling steps, and postural changes. A diminished sense of smell, constipation, dizziness upon standing, and recurrent falls may also join the picture. However, because each of these signs can stem from other medical conditions as well, they should not be taken in isolation as definitive proof of dementia.
What to Expect During an Initial Evaluation
When a persistent change in memory, behavior, or function occurs, the first step is usually to consult a family physician. The evaluation may include a medication review, blood tests, cognitive assessments, and screening for other conditions that can mimic dementia symptoms - such as depression, sleep disorders, thyroid issues, nutritional deficiencies, or acute infections. Depending on the findings, the patient can be referred for specialized geriatric, neurological, or psychogeriatric assessments. Large-scale studies tracking behavioral and aberrant motor symptoms have further reinforced how vital comprehensive evaluations are when these early warning signs cluster together [PubMed: 35491774, PubMed: 25737233].
"With the onset of any of these symptoms, and especially when several appear simultaneously, it is vital to seek a geriatric evaluation," Dr. Maayan concludes. "An early, precise diagnosis allows us to tailor treatments, ease symptoms, plan ahead, and preserve the quality of life for both the patient and their family."
Nutritional Support and Brain Health: Can Food Help Protect Cognitive Function?
While diet alone cannot prevent or cure neurodegenerative diseases, mounting scientific and nutritional research highlights the powerful role that a heart- and brain-healthy diet - such as the Mediterranean diet - plays in supporting cognitive vitality and potentially slowing cognitive decline. Incorporating specific nutrient-dense foods can help nourish brain cells, reduce oxidative stress, and protect cerebral blood vessels:
Leafy Green Vegetables: Rich in vitamin K, lutein, folate, and beta-carotene, greens like spinach, kale, and Swiss chard have been linked in studies to a slower rate of cognitive aging.
Berries: Blueberries, strawberries, and blackberries are packed with anthocyanins and powerful antioxidants that help reduce oxidative stress and neuroinflammation.
Omega-3 Rich Fatty Fish: Salmon, sardines, mackerel, and tuna provide essential EPA and DHA fatty acids, which are crucial for maintaining brain cell structure and lower risks of cognitive impairment.
Nuts and Seeds: Especially walnuts, which are rich in plant-based omega-3 fatty acids (ALA), vitamin E, and protective antioxidants.
Extra Virgin Olive Oil: A staple of the Mediterranean diet, loaded with polyphenols that act as potent anti-inflammatories and support healthy cerebral blood flow.
Whole Grains: Foods like oats, brown rice, and quinoa help maintain stable blood sugar levels, preventing sharp fluctuations that can harm small blood vessels in the brain.
Combining these dietary habits with regular physical activity and a healthy lifestyle provides vital supportive care for long-term mental sharpness and overall well-being.
The core message for families is clear: do not panic over every minor lapse in memory, but never brush off persistent, ongoing changes with the excuse that "it's just old age." When something consistently feels different in behavior, memory, or daily functioning, trust your gut and get it checked.
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