Can You Increase Your IQ? Here's What Science Really Says

Can you increase your IQ, or are you stuck with the number from a test in third grade?

Most of us grew up thinking IQ was locked in at birth, like eye color or blood type. Researchers at the University of Michigan found that training on certain working memory tasks can transfer to fluid intelligence, and the more people trained, the more their scores improved. That study upended decades of assumptions about how fixed intelligence really is.

Certain aspects of your intelligence respond well to training, while others show hardly any improvement regardless of how many brain training games you download. This guide explains which points are supported by research, which are mainly based on marketing, and what a realistic weekly habit looks like if you want to enhance intelligence without turning your life into a science experiment.

🎯 We'll show you how Nibble fits into that habit with a short lesson at a time.

Here's the main point if you're reading this during lunch.

• Your IQ scores can shift somewhat through consistent working memory training.
• Fluid intelligence responds better to training than crystallized intelligence does.
• Sleep, physical exercise, and a healthy diet all affect cognitive performance more than most people assume.
• Gains from brain training tend to fade without ongoing practice.
• Building broad general knowledge strengthens crystallized intelligence over time.

🎯 Wonder how a five-minute habit compares to a whole semester of studying? See what daily learning on Nibble really means.

An IQ test does not assess a single trait; rather, it measures just a limited part of your total cognitive ability — comprising both fluid intelligence and crystallized intelligence — and these two types of intelligence behave quite differently when you start to try to change them.

Fluid intelligence is the capacity to deal with new problems without having to draw on previous knowledge; you can think of it as your mental flashlight in a dark room. Crystallized intelligence is instead all the things you have already learned about that room — such as facts, vocabulary, and the patterns you've acquired through both formal education and ordinary life experience.

Psychologist Howard Gardner's theory of multiple intelligences adds another layer, arguing that things like emotional intelligence, spatial reasoning, and musical skill deserve their own categories too. It's a popular idea, but it's genuinely debated among researchers, so treat it as one lens rather than settled science.

A more recent approach that emphasizes behavior, known as relational frame theory (RFT), examines the way in which we learn to relate one idea to another, and some psychologists employ RFT in order to explain why some thinking skills transfer between situations while others do not.

The study carried out by Jaeggi and Buschkuehl at the University of Michigan was the one that attracted everyone's attention. People were trained on a difficult working memory task known as the dual n-back, and those who carried out the training for the longest period showed the greatest improvement in fluid intelligence. This was the first clear evidence to show that intelligence quotient scores were not as fixed as the textbooks had claimed.

Nevertheless, the more recent attempts to replicate the findings, including the widely cited 2013 study in PLOS ONE, revealed smaller and less consistent effects. While some laboratories observed actual improvements, others saw almost nothing when practice effects were taken into account.

There is an important distinction contained in that statement. While carrying out an actual IQ test mainly results in an improvement in the score achieved on that particular test, working memory training aims at developing the basic skill instead, which is a far more difficult objective. The reasonable conclusion, therefore, is that training may make a small difference, but it does not result in a permanent improvement, and any benefits tend to disappear if the training is not continued.

More recent research has introduced a new aspect: a large study carried out in 2025 and published in the Journal of Political Economy tracked thousands of children who were six or seven years old as they took part in a working memory program incorporated into their regular school curriculum and discovered genuine, long-lasting improvements in their fluid IQ, together with a noticeable increase in their placement in advanced schools three years later.

The most probable reason is that both the age of the individuals, the way the program was designed, and the length of the training are all more important than what any one study alone can show.

🎯 Want the research-backed version of "get smarter," minus the hype? Nibble breaks real findings into lessons you can actually finish.

IQ tests were designed to spot struggling students

Nibble digs into the science behind how minds get measured

Find out why

Don't go for the miracle-cure kind of headlines; the habits that are actually backed by evidence are generally rather dull, and that's usually a positive sign in the scientific field.

Sleep. Seven to nine hours supports memory consolidation and executive function, the mental abilities you need to plan, concentrate, and switch between tasks. If you don't get enough sleep, both of these functions will suffer quickly.

Physical activity. Aerobic exercise increases blood flow to the hippocampus, which supports memory formation and general brain function. Neuroscience researchers have linked regular movement to slower cognitive decline as people age.

Nutrition. A healthy diet rich in omega-3s and low in sugar spikes supports steady cognitive function throughout the day. Nutrition won't make you a genius overnight, but chronic poor eating habits drag down attention span and focus.

Learning something genuinely new. Picking up a language, an instrument, or music lessons forces your brain to build new connections, a process researchers call neuroplasticity. This mostly strengthens crystallized intelligence and cognitive flexibility rather than fluid intelligence. There are many things to learn once you look beyond your usual routine.

Managing stress. Chronic stress floods your system with cortisol, which interferes with working memory and critical thinking. Even short daily breaks help protect your mental abilities over time.

What helps your brain, and how much it actually helps

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Brain-training apps are unfairly criticized, and some of that criticism is well deserved. Back in earlier years, Lumosity reached a settlement with the Federal Trade Commission concerning its exaggerated assertions that the games on the app could improve general intelligence and postpone cognitive decline. Marketing that claims to boost your IQ overnight should be met with suspicion.

Under the excitement, there is, however, a more modest and better-supported assertion. Active recall — this involves retrieving information from memory rather than simply rereading it — is one of the few study methods for which there is strong evidence; quizzes, trivia, and games that require you to fetch an answer from your own head develop this ability, even though they do not increase your IQ score.

That is the kind of environment in which Nibble exists. The trivia quizzes and lessons on logic are not advertised as brain-training games capable of boosting your intelligence quotient. Instead, they provide a low-pressure method of carrying out active recall and keeping your problem-solving abilities in good shape, something you do in place of another scrolling session rather than in place of sleep or exercise.

🎯 You can get five minutes of real recall practice on Nibble by just spending five minutes scrolling.

Fluid intelligence is tenacious. Crystallized intelligence is simpler to develop and is nearer to what most people have in mind when they want to get smarter.

Crystallized intelligence is the accumulated knowledge and vocabulary built through formal education and reading. It grows through everyday curiosity, following conversations about history, holding your own on science questions, or connecting psychology to politics. None of that comes from a single hack. It comes from steady exposure to new topics over time.

That is exactly where a habit such as Nibble comes into play. The program offers lessons covering over 35 different topics and in five different formats, ranging from text and audio to games and conversations with historical figures, so a person who spends five minutes on a lesson about Logic on one day and another on Psychology the next is gradually developing genuine, well-established intelligence, bit by bit.

Here's the honest takeaway. Some parts of your ability to increase your IQ respond to training. Others barely move, no matter how many puzzle apps you try. Either way, staying mentally active is worth it, not to chase a number on a standardized testing scoresheet, but because a curious life feels better than a bored one.

🎯 Nibble delivers short daily lessons across more than 35 topics, built for people who want to stay curious without committing to a full course. Download Nibble and turn your next five free minutes into something that actually sticks.