Is raising IQ hard, or is it basically impossible? I hear conflicting things about whether you can improve your intelligence through effort. If it is possible, what would it actually take, and how much change could you realistically expect?
It’s not just hard, it’s extremely difficult to the point of being nearly impossible for adults. You can learn skills and knowledge, but changing your underlying cognitive ability is a different story.
Raising IQ in adulthood is extraordinarily difficult because IQ largely reflects stable cognitive traits with strong genetic components. You can improve specific skills, expand knowledge, and get better at test-taking, but these aren’t true IQ increases. Early childhood is the window where interventions matter: nutrition, education, stimulating environments can impact developing brains. For adults, the most realistic goal is optimizing what you have through learning strategies, managing health, and building expertise in areas that matter to you. Claims of significant IQ boosts after childhood are almost always either measurement errors or people confusing skill acquisition with intelligence gains.