On a quiet morning in Abuja, an elderly man sits in front of a television that has been on since dawn. The room is still, except for the flicker of images he no longer comments on. When asked what he watched an hour earlier, he smiles politely but cannot say. His family assumes it is normal aging. But new science suggests something more unsettling. What we call “normal forgetting” may increasingly be shaped by how we live, not only by how we age.
A large body of recent research tracking adults over long periods has found a consistent pattern. People who spend more time in mentally passive routines such as prolonged television viewing or repetitive scrolling face higher risks of cognitive decline, while those who regularly engage in reading, learning, conversation, and problem solving show slower rates of memory loss. One synthesis of findings published in major public health literature put it plainly: cognitive activity builds resilience against decline, while mental inactivity accelerates vulnerability.
That distinction matters because dementia, including Alzheimer’s disease, is often treated in public imagination as an unavoidable destiny. But neurologists increasingly describe it differently. As one clinician at the Mayo Clinic has noted in public education briefings, “The brain thrives on use. When it is challenged, it adapts. When it is neglected, it weakens.” The implication is not that dementia is fully preventable, but that its trajectory is not fixed.
Globally, more than 55 million people are currently living with dementia, a number projected to rise sharply in the coming decades as populations age. Yet what is changing is not only the scale of the condition but the understanding of its contributors. Alongside age and genetics, lifestyle factors are now seen as significant influences. Among them, cognitive inactivity is emerging as one of the most overlooked risks.
The mechanism is both simple and unsettling. The brain, like muscle tissue, responds to demand. Tasks that require memory, attention, language, and reasoning strengthen neural networks over time. In contrast, long periods of low engagement reduce that stimulation. As researchers in cognitive neuroscience have summarized, “neural efficiency is maintained through continuous cognitive challenge.” Without that challenge, efficiency declines.
This is where modern life becomes relevant in a way that is easy to miss. The same devices that connect and entertain also reward minimal effort. Endless short videos, algorithm driven feeds, and passive consumption patterns create what some scientists describe as “low friction cognition.” The mind is fed images, not questions; stimulation, not interpretation. Over time, this may matter more than we assume.
In Nigeria, this reality is unfolding within a unique cultural shift. Older forms of mental engagement such as storytelling, communal debate, apprenticeship learning, and extended family conversation once provided daily cognitive exercise. Today, they are increasingly replaced by solitary screen time. The change is subtle, but its cumulative effect may be profound.
Yet the emerging evidence is not a sentence of despair. It is, unexpectedly, a guide. Across multiple studies, simple activities consistently show protective association with brain health. Reading, learning new skills, engaging in social interaction, and even structured games that require strategy are repeatedly linked with slower cognitive decline. One widely cited review concluded, “lifelong cognitive engagement is associated with reduced risk of dementia-related outcomes.”
Still, science is careful not to overpromise. Dementia cannot be reduced to lifestyle alone. Genetics, vascular health, education, and age all play roles that cannot be ignored. But what has shifted in recent years is the recognition that daily habits are not neutral. They accumulate quietly, shaping either resilience or fragility over time.
There is a broader implication here that extends beyond medicine. Societies often fear memory loss as an individual tragedy, but rarely as a collective warning. A population that gradually loses its habit of deep thinking does not collapse suddenly. It drifts. Attention shortens. Curiosity weakens. Public reasoning becomes thinner. The change is almost invisible until it is advanced.
This is why the most important interventions may not be clinical but cultural. Not everyone can prevent dementia, but nearly everyone can strengthen cognitive engagement. The tools are not expensive. They are familiar. Read more than you scroll. Speak more than you consume. Solve problems rather than only observe them. Teach. Question. Recall. These are not abstract recommendations. They are daily acts of mental preservation.
The man in Abuja may or may not develop dementia. Medicine cannot say with certainty. But the question his story raises is larger than him. It is about whether modern life is quietly reshaping the conditions of memory itself.
And if it is, then the warning is not only medical. It is civilizational.
Because forgetting, like remembering, is also learned.
– Inah Boniface Ocholi writes from Ayah – Igalamela/Odolu LGA, Kogi state.
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