Everywhere we look, there are screens. Whether it’s the television, smartphones or tablets, many of us spend hours each day in front of them—often without realising how much time has passed. After a long day, it may seem harmless to unwind by scrolling through Instagram or watching a series. However, recent research suggests that this habit may carry risks that go beyond what we can see.
A new study published in the American Journal of Preventive Medicine found that mentally passive screen time is linked to a higher risk of developing dementia over time. The study followed over 20,000 adults for nearly two decades and uncovered an important distinction: not all screen time has the same effect. Activities that require thinking and engagement, such as reading, problem-solving or purposeful computer use, were associated with a lower risk of cognitive decline, while passive consumption showed the opposite effect.
Researchers also found that even small changes can make a difference. Replacing just one hour of passive screen time with a mentally active activity could reduce dementia risk by around 7%. This occurs because the brain functions much like a muscle—it adapts to how it is used. Activities that challenge the mind help strengthen neural connections and support memory and reasoning, while passive habits provide little stimulation and may contribute to cognitive decline over time.
This doesn’t mean screens themselves are the problem, but rather how we use them. Spending hours consuming content without interaction can gradually affect mental sharpness, especially when combined with a sedentary lifestyle. On the other hand, selecting activities that engage the mind—even while sitting—can help protect long-term brain health.
Taking care of our health isn’t just about reacting when problems arise; it’s also about making conscious decisions that safeguard our future. Sometimes, a small adjustment today can prevent a much bigger challenge tomorrow.
Engaging in productive activities, such as reading articles or books online, learning a new skill through educational videos, trying brain-training apps or watching documentaries that encourage reflection and understanding, can be great options. Meaningful conversations or writing can also stimulate the mind and make your screen time more beneficial.
If you would like to learn more about how to take better care of your health, you are welcome to join our Health Day meetings held every Tuesday at the Universal Church nearest to you. There, you can receive practical tips designed to strengthen your well-being alongside the medical care you may already be following.
Event: Health Day meetings
Day and time: Tuesdays at 7:30pm (also at 7am, 10am & 3pm)
Location: Your nearest Universal Church
Disclaimer: The UCKG HelpCentre’s spiritual advice is to be seen as a complement to the scientifically proven treatment you may be receiving. The UCKG HelpCentre does not claim to heal people but believes that God can through the power of faith. Always follow your doctor’s instructions.
https://www.washingtonpost.com/opinions/2026/04/07/dementia-risks-study-mental-activity-tv
