Yes, you can increase your IQ score, but with important caveats. Education alone raises IQ by roughly 1 to 5 points per additional year of schooling, and several lifestyle factors can meaningfully sharpen the cognitive abilities that IQ tests measure. At the same time, genetics plays an increasingly large role as you age, and some popular “brain training” methods don’t deliver on their promises. The honest answer is that certain strategies work, others don’t, and the gains have real limits.
What IQ Actually Measures
IQ tests capture two broad types of mental ability. The first, called fluid intelligence, involves on-the-spot problem solving: abstract reasoning, pattern recognition, working memory, and processing speed. The second, crystallized intelligence, reflects accumulated knowledge and skills: vocabulary, general information, and expertise you’ve built over time.
These two types follow very different paths across your life. Fluid intelligence peaks in early adulthood and gradually declines from there. Crystallized intelligence keeps growing into your 60s and 70s. This distinction matters because when people ask about “raising IQ,” they usually mean fluid intelligence, the raw brainpower side. That’s also the harder one to move.
How Much Genetics Constrains You
A study of 11,000 twin pairs from four countries found that the genetic contribution to general cognitive ability increases linearly with age: about 41% in childhood, 55% in adolescence, and 66% by young adulthood. In other words, the older you get, the more your IQ reflects your DNA rather than your environment. That still leaves roughly a third of the variation in adult IQ shaped by non-genetic factors, which is a meaningful window. But it does explain why interventions tend to have larger effects on children than on adults.
Education Has the Strongest Evidence
A meta-analysis covering over 600,000 participants across 42 data sets found that each additional year of education raises IQ by an average of about 3.4 points, with estimates ranging from 1 to 5 points depending on study design. This isn’t just about learning test-taking tricks. Education appears to genuinely strengthen the reasoning and verbal skills that IQ tests measure. The effect holds across different research methods, including studies that used policy changes (like raising the mandatory school-leaving age) to isolate education’s impact from the possibility that smarter people simply stay in school longer.
For adults past school age, this finding still has practical implications. Engaging in structured learning, whether through formal coursework, professional training, or self-directed study in challenging subjects, exercises the same cognitive muscles.
Exercise Changes Your Brain
Aerobic exercise boosts a protein that acts as fertilizer for brain cells, supporting the growth and survival of neurons in areas critical for memory and executive function. Levels of this protein naturally decrease with age, which tracks with age-related cognitive decline. Exercise can partially reverse that drop.
A year-long walking program studied in older adults found that the exercise group showed improved performance on tasks requiring mental flexibility, with the benefits mediated by increased levels of this brain-growth protein. The effects were strongest in the oldest participants (over 71), suggesting exercise may be most valuable precisely when cognitive decline accelerates. While no study has shown that jogging will add 10 points to your IQ, the evidence for exercise protecting and modestly improving executive function, the core of fluid intelligence, is solid.
Brain Training Games Don’t Transfer Well
This is where many people waste their time. Working memory training programs, particularly the “n-back” task that gained popularity in the late 2000s, promised to boost fluid intelligence through daily practice. A multi-level meta-analysis of n-back training studies found that the transfer effects to fluid intelligence and broader cognitive control were “very small.” Most of the improvement was task-specific, meaning people got better at the training game itself without meaningfully improving their general reasoning ability.
If you’ve been spending 20 minutes a day on a brain training app expecting it to make you smarter in any general sense, the evidence suggests you’d be better off spending that time exercising, learning a musical instrument, or studying something new.
Learning Music Builds Cognitive Reserve
Musical training stands out from generic brain training because it demands simultaneous engagement of memory, attention, motor coordination, and auditory processing over long periods. A study comparing older adults who had played instruments across their lives to well-matched controls (same education levels, socioeconomic status, and physical activity) found that musicians outperformed in global cognition, working memory, executive function, language, and visuospatial abilities. The strongest association was with working memory, a foundational skill that supports nearly every other cognitive process.
Research on older adults who started learning an instrument later in life found similar benefits for executive function and working memory compared to control groups. You don’t need to have started as a child, though earlier and longer engagement produces larger effects.
Nutrition Matters, But Not How Supplements Promise
Correcting genuine nutritional deficiencies can have dramatic effects on cognitive ability, particularly in children. Iodine supplementation in populations with even mild iodine deficiency has been shown to raise children’s IQ levels, which is why iodized salt became one of the most successful public health interventions of the 20th century. However, the relationship isn’t “more is better.” A study of nearly 2,000 Portuguese schoolchildren found that those with excessively high iodine levels actually had lower IQ scores, with children in the highest iodine group showing 2.6 times the odds of below-average IQ compared to children with moderate levels.
The pattern with iodine applies broadly to nutrition and cognition: deficiency hurts, correction helps, and excess can backfire. If you’re eating a reasonably balanced diet in a developed country, expensive nootropic stacks or megadose vitamins are unlikely to move your IQ. If you have an actual deficiency, whether in iodine, iron, or other key micronutrients, correcting it can unlock cognitive ability that was being suppressed.
Meditation Reshapes Brain Structure
An eight-week mindfulness program produced measurable increases in gray matter density in brain regions involved in learning, memory, self-awareness, and perspective-taking. These structural changes were significantly greater in meditators compared to a control group and were accompanied by improvements in awareness and attention. While these studies haven’t directly measured IQ changes, the brain regions affected, particularly the hippocampus and areas involved in executive control, are the same ones that support the cognitive skills IQ tests measure.
What Realistic Gains Look Like
Nobody is going from an IQ of 100 to 130 through lifestyle changes. The realistic picture looks more like this: consistent education and intellectual engagement can add a few points over years. Exercise protects against decline and modestly sharpens executive function. Musical training strengthens working memory and related skills. Correcting nutritional deficiencies removes barriers to performing at your potential. Meditation supports the brain structures underlying attention and learning.
These effects are additive rather than dramatic on their own, and they tend to be larger for crystallized intelligence (knowledge-based abilities) than for fluid intelligence (raw processing power). They also compound over time. A person who spends decades exercising regularly, learning challenging skills, and staying intellectually engaged will almost certainly test higher at 65 than an equally gifted person who did none of those things. The gains are real, even if the ceiling is set partly by biology.