After work, you just want to collapse on the sofa; you know you should exercise but can’t bring yourself to move. You think about cooking healthy meals at home, but “lack of time” leads you to order takeout again and again. You say you’ll go to bed early, but then you scroll on your phone and handle trivial tasks, and before you know it, it’s past midnight. Afterwards, you fall into deep self-blame, thinking you lack self-discipline.
Stop blaming yourself. This may not be your fault at all.
A new paper published in The Lancet Healthy Longevity suggests that this is often not a personal failure. You might just be trapped in a dilemma called “temporal inequity”—when we can’t even squeeze out the basic time needed to maintain brain health, a “healthy lifestyle” is simply an unrealistic hope. What’s more, long-term “time poverty” is secretly damaging your brain and increasing the risk of developing dementia.
You’ve probably heard all sorts of health guidelines, like “150 minutes of exercise per week,” “8 hours of sleep per day,” “more socializing with friends,” and so on. But why can’t most people follow them?
This paper from The Lancet integrates past research from various fields, including neuroscience, epidemiology, and sociology, and identifies a problem that has always been overlooked but is, in fact, crucial: time. After all, sleep takes time, exercise takes time, cooking a healthy meal takes time, having in-depth conversations with friends takes time, and even managing chronic conditions like high blood pressure and diabetes takes time. All the previous advice from the research community on “brain health” has operated on a default premise: that people have sufficient, controllable time. But for many people around the world, this premise simply doesn’t hold.
Sleep Time
Authoritative agencies recommend that adults aged 18 to 64 get 7 to 9 hours of sleep per night, while those over 65 need 7 to 8 hours. Chronic sleep deprivation (less than 6 hours) increases the risk of diseases like diabetes, depression, heart disease, high blood pressure, and stroke, all of which are risk factors for dementia themselves.
Exercise Time
The World Health Organization recommends that adults should engage in 150–300 minutes of moderate-intensity aerobic exercise or 75–150 minutes of high-intensity aerobic exercise per week.
Studies show that about 45–60 minutes of moderate-to-high-intensity exercise daily is significantly associated with improved cognitive performance. At the same time, sitting for more than 10 hours a day significantly increases the risk of dementia.
Diet Time
It takes the brain about 20 minutes after a meal to receive the “full” signal. If you wolf down your food in a few minutes, your brain may have consumed far more than your body needs before it gets the signal. This not only leads to weight gain but also causes blood sugar to fluctuate dramatically, which can cause significant damage to the brain over time. We should spend 15–20 minutes on breakfast and 20–30 minutes on lunch daily.
Social and Leisure Time
In-depth conversations with people can not only exercise the brain’s abilities like listening comprehension, language expression, emotional intelligence, and memory retrieval, but also bring a sense of satisfaction. A report from The Lancet shows that addressing “social isolation” could prevent 4% of dementia cases worldwide.
Let’s add up this time:
7 hours (sleep) + 1 hour (exercise) + 1 hour (three meals) + 1 hour (socializing) = 10 hours
To complete just the most basic activities for maintaining brain health, you need at least 10 hours a day—and this is just the authors’ conservative estimate! More importantly, these 10 hours don’t include “must-do” activities like work, study, commuting, housework, caring for family members, and personal hygiene.
Now, let’s calculate your “time budget”: in a 24-hour day, subtract the time spent on work, commuting, chores, and caring for your family. How much is left? Is this remaining time enough to cover the 10-hour “minimum cost for brain health”? For many people, the answer is harshly—no.
This is the reality of “time poverty.” It’s like an invisible shackle that makes us know what is right but powerless to do it. Those suffering from “time poverty” have to sacrifice sleep, give up exercise, hastily eat their meals, or cut off social interactions. These daily “trade-offs” are gradually eroding brain health.
What is “stealing” our time?
Researchers believe that multiple societal factors, to some extent, influence people’s time allocation and experience of time use.
First is the influence of the “performance culture” in today’s social environment. “Busyness” is often given a positive value, while “leisure” can sometimes be misinterpreted as idleness. This social atmosphere invisibly prompts people to constantly accelerate, using every minute to “create value,” which in turn can lead to a compression of rest time.
Public facilities still have room for improvement. For example, the coverage of affordable kindergartens and nursing homes needs to be expanded. In some areas, inconvenient public transportation networks make commuting a major time sink.
There are also gender differences in time allocation. Globally, women often have to balance work and family responsibilities, making their time more fragmented and their autonomy over time relatively limited.
Differences in socioeconomic status also lead to disparities in time use. Groups with relatively limited incomes, to make a living, either have to spend more time working overtime or holding multiple jobs, or can only live in remote, cheaper areas, enduring longer commutes. Those in better economic conditions have more opportunities to save time by purchasing services (like housekeeping or errand running) and can focus their energy on more important matters like health management. This disparity creates a cycle, making the imbalance in time allocation increasingly pronounced.
How to “reclaim” time and protect brain health?
Researchers have proposed some directions from a macro policy perspective, such as protecting the “right to disconnect,” legislating that employees have the right to be “offline” after work to prevent it from encroaching on rest time; implementing a four-day work week to shorten working hours without a pay cut, releasing more discretionary time; creating “20-minute communities” through urban planning so that residents can meet daily needs on foot or by bike within 20 minutes, reducing commuting time; and making affordable childcare and elderly care services accessible to free up family caregivers and alleviate time pressure.
For ordinary people, how to achieve maximum “time autonomy” under objective constraints, you can try the following methods:
- Guard core health time and use “fragmented time” to supplement
Treat sleep, exercise, and meals as “non-negotiable items” and prioritize the “minimum cost for the brain.” For example, force yourself to be asleep by 11 PM and try to stick to it. Put your phone away during meals and focus on eating, making sure to get at least 20 minutes for a meal.
For exercise, if you don’t have a large, continuous block of time, you can find opportunities to fit it in and break it into smaller parts. For example, get up and walk around for every hour of work. Run or bike to the subway station on your commute. For other exercise suggestions, you can revisit past articles like “A Highly Underrated Exercise: Even Doing It Once a Week Has Benefits Far Beyond Imagination” and “Just 4 Minutes a Day Reduces Heart Attack Risk by 45%! This Exercise Has a High Cost-Effectiveness Ratio That Many People Don’t Know About.” These are all high-cost-effectiveness exercises that don’t take much time but are very effective. - Prioritize tasks and reduce procrastination
You can use the four-quadrant time management method to divide work and life tasks into four categories: important and urgent, important but not urgent, urgent but not important, and neither urgent nor important. Prioritize completing tasks that are both important and urgent, and set aside a fixed time each day to push forward on tasks that are important but not urgent.
At the same time, be sure to avoid procrastination. Many tasks are not actually as time-consuming as they seem, and the time wasted in the process of procrastinating might be more than the time it takes to do the task itself. By reducing procrastination, you’ll find that you magically “have” more time. (To overcome procrastination, you can revisit the past article “One Method to Save You from Procrastination! Simple and Effective, Read It Now!”) - Rationally divide responsibilities and proactively take control of your time
Share responsibilities at home. Agree with your family on a division of housework and childcare to prevent one person from bearing the entire “second shift,” allowing everyone to have their own discretionary time. - Adjust your mindset, accept “imperfection,” and reduce internal friction
Don’t strive to be “omnipotent.” If you don’t meet your health time goals for a day, don’t blame yourself. Just readjust the next day to avoid emotional friction that consumes extra energy.
Focus on the “quality” of time rather than the “quantity.” For example, a high-quality 20-minute meditation is more beneficial for the brain than an hour of groggy rest. Only by rejecting “time-wasting activities” can you make the limited time you have more valuable.