Every few months a list goes viral claiming that smart people swear more, stay up later or keep messy desks. It's flattering if you do those things, and it spreads fast for exactly that reason. The trouble is that most of these lists mix solid research with a single small study and a lot of wishful thinking.
So here's a cleaner version. Below are nine habits that research genuinely links to higher intelligence, what that link means (it's usually not what the headlines say), and three popular "smart people habits" that don't hold up.
First, a word on "linked to"
Almost every habit on this list comes from correlational research. That means two things tend to show up together, not that one causes the other. A habit can be linked to intelligence in three different ways:
- The habit builds ability. Education is the clearest example.
- Ability makes the habit more rewarding. People who find reading easy tend to read more.
- Something else drives both. Curiosity, health or a supportive environment can boost thinking and shape habits at the same time.
Often it's all three at once, which changes how you should read every "smart people do X" headline.
9 habits linked to higher intelligence: learning
The first four are about how people take in and build knowledge.
1. They read regularly, and widely
Reading is tied closely to vocabulary and general knowledge, the core of what psychologists call crystallised intelligence. The psychologist Keith Stanovich described a "Matthew effect" in reading: children who read well read more, which builds their vocabulary and knowledge, which makes reading easier still. For adults, reading is both a sign of verbal ability and one of the main ways it grows. Our explainer on fluid vs crystallised intelligence shows why this kind of knowledge keeps building well into later life.
2. They keep learning long after school
Education has some of the strongest evidence of any factor here. A large meta-analysis by Stuart Ritchie and Elliot Tucker-Drob found that each additional year of schooling was linked to gains of roughly one to five IQ points, and studies using natural experiments suggest at least part of that is genuinely causal.
3. They seek out mentally demanding activities
Some people are drawn to complex books, debate or difficult skills. Researchers sometimes call this "need for cognition" or "intellectual engagement." It correlates with measured intelligence, and in older adults, a cognitively busy lifestyle is linked to better thinking with age. Whether the activities protect thinking or sharper people simply choose them is still debated.
4. They follow their curiosity
Of the Big Five traits, openness to experience has the most consistent link with intelligence, especially its intellectual side: enjoying ideas, abstract questions and new information. The correlation is moderate, not huge, so plenty of curious people score average and plenty of high scorers are incurious. Curiosity is a fellow traveller of intelligence, not a test result.
The thinking habits
These two are less about what you know and more about how you handle it.
5. They pause before trusting a quick answer
The Cognitive Reflection Test, developed by Shane Frederick, asks questions with a tempting wrong answer, like the famous bat-and-ball puzzle. Scores on it correlate with general cognitive ability. The habit underneath is simple: when an answer arrives instantly, check it before you commit.
6. They're willing to change their minds
Researchers studying "actively open-minded thinking" measure how willing people are to seek out evidence against their own views. Higher scores tend to go with better reasoning performance. This one is a thinking style as much as an ability, which is good news: it can be practised.
The everyday habits
The last three won't make you a genius, but they keep the machinery running well.
7. They move their bodies
Many studies link regular aerobic exercise with better attention, memory and executive function, with the clearest evidence in older adults. Exercise is less about raising your ceiling and more about helping your brain work near it.
8. They protect their sleep
Sleep loss reliably impairs attention, working memory and reasoning. It won't change your underlying ability, but chronic poor sleep can hide it. Treat this as performance maintenance.
9. They stay socially connected
Observational studies of ageing often find that people with active social lives keep their thinking sharper for longer. Conversation is surprisingly demanding. The causal direction isn't settled, but it's a pleasant habit to bet on.
How strong are these links?
Not all of these habits are equal. Here's a quick summary of how firm the evidence looks.
| Habit | What the link looks like | Likely causes higher ability? |
|---|---|---|
| Reading widely | Strong link with vocabulary and knowledge | Partly, especially for verbal skills |
| Continued education | Consistent gains per year of schooling | Yes, at least in part |
| Mentally demanding hobbies | Moderate link, clearer in older adults | Unclear, likely two-way |
| Curiosity and openness | Moderate correlation | Mostly a related trait, not a cause |
| Pausing to check answers | Correlates with ability | Helps performance, not ceiling |
| Changing your mind | Linked with better reasoning | Improves how you use ability |
| Exercise | Many studies show cognitive benefits | Supports performance and brain health |
| Sleep | Loss clearly impairs thinking | Protects performance |
| Social connection | Linked with healthier cognitive ageing | Unclear |
3 "smart people habits" that are myths
Myth 1: Night owls are smarter
A few studies have found small correlations between later sleep times and certain measures of ability, and the headlines did the rest. The effects were small, the samples specific, and chronotype is shaped largely by genetics and age. Staying up late won't make you clever, and forcing yourself to will mostly make you tired. If you're curious what chronotype does relate to, see what your chronotype says about your personality.
Myth 2: A messy desk means a brilliant mind
This one usually traces back to research suggesting that a disorderly environment might nudge people towards more unusual ideas in a lab task. That's a claim about creativity in a single setting, not intelligence, and it has been debated since. Plenty of highly capable people are meticulously tidy.
Myth 3: Daily brain games will raise your IQ
People do get better at the games they practise. The contested part is whether those gains spread to general reasoning, and careful reviews have mostly found little or no "far transfer." We cover the evidence in detail in do brain training apps work?.
What to actually take from this
If you want to think better, the habits worth copying aren't quirky. They're steady:
- Read things that stretch you.
- Keep learning something difficult.
- Check your fast answers.
- Look for evidence you might be wrong.
- Sleep, move and see people you like.
None of these will add twenty points by next month. Together, they help you use the mind you have, and some of them may build it over years. If you'd like a snapshot of where your reasoning sits today, you can take our free IQ test and use the result as a starting point rather than a label.
The bottom line
Real habits linked to intelligence are mostly about engagement: reading, learning, curiosity and careful thinking, supported by sleep, exercise and connection. The viral ones, like late nights and messy desks, rest on thin evidence. And "linked to" rarely means "causes," so the best reason to adopt these habits is that they make thinking more enjoyable, not that they guarantee a higher score.
FAQ
Do intelligent people read more?
On average, yes. Reading is strongly linked with vocabulary and general knowledge, and the relationship runs both ways: strong readers read more, and reading builds verbal ability.
Can changing your habits raise your IQ?
Education has the best evidence for genuine gains. Habits like sleep and exercise mainly help you perform closer to your ability, and quick fixes rarely produce lasting jumps.
Are night owls really more intelligent?
The evidence is weak. A few studies found small correlations, but chronotype depends largely on genetics and age, and staying up late doesn't make anyone smarter.
Is curiosity a sign of high intelligence?
Curiosity, especially enjoying ideas, is moderately correlated with intelligence. It's a related trait rather than proof, so many curious people score around average and that's perfectly fine.
