The Surprising Benefits of Higher Intelligence (And How to Achieve Them)

While many focus on the professional advantages of IQ, recent large-scale studies have revealed impacts on everyday life that go far beyond the workplace.

1. Longevity and “Cognitive Epidemiology”

One of the most striking findings in modern psychology is the direct correlation between intelligence and life expectancy. In a comprehensive meta-analysis of longitudinal studies, researchers found that a one-standard-deviation increase in IQ (about 15 points) is associated with a 21% to 24% lower risk of mortality [2].

This isn’t just about avoiding accidents; higher intelligence is a “protective factor” against cardiovascular disease, respiratory illness, and smoking-related cancers. Experts suggest this is because high-IQ individuals are better at “health literacy”—processing complex medical advice, adhering to multi-step treatment plans, and navigating modern environments that require constant risk assessment.

2. Time Management and Goal Achievement

High-IQ individuals are statistically more successful at using their time in a way that aligns with their ideal life goals [1]. This is likely tied to “fluid reasoning,” the ability to solve novel problems and plan for future contingencies. On community platforms like Reddit’s r/cognitiveTesting, users frequently report that high-cognitive ability allows them to “batch” complex tasks more efficiently, reducing the mental fatigue associated with heavy decision-making.

3. Open-Mindedness and Political Tolerance

Higher intelligence is strongly correlated with “actively open-minded thinking”—the willingness to consider evidence contradictory to one’s current beliefs [1]. Data shows that high-IQ individuals are more likely to exhibit tolerance for groups they politically oppose, suggesting that cognitive power provides the mental “buffer” needed to process disagreement without defaulting to tribal hostility.

The debate over whether intelligence is “fixed” or “malleable” has been refined by recent data. While “rank-order stability” remains very high from late adolescence through adulthood [3], there are specific, evidence-based ways to optimize and protect your brain power.

Education and the “Protective Plateau”

Research across 33 countries confirms that more education is associated with better memory and larger brain volume [4]. However, a recent study in Nature Medicine clarified a common misconception: while education “lifts” your cognitive baseline, it does not necessarily slow the rate of decline in old age [4]. This means the goal of “achieving” higher intelligence is most effective in early life and early adulthood to build a higher “cognitive reserve.”

Targeted Personality Development

Since intelligence and personality are deeply intertwined, shifting certain behaviors can mimic the benefits of higher IQ. A massive meta-analysis of over 1.3 million individuals found that the “Intellect” facet of Openness and the “Industriousness” facet of Conscientiousness are the strongest predictors of knowledge acquisition [5]. By deliberately cultivating curiosity and disciplined work habits, individuals can increase their “invested intelligence”—the actual knowledge and skills derived from raw brain power.

If you are concerned about the emotional aspects of high cognitive ability, see our analysis on The Correlation Between Intelligence and Mental Health.

Achieving the benefits of higher intelligence requires a two-pronged strategy: building “crystallized” knowledge and protecting “fluid” capacity.

1. Prioritize “Invested” Learning: Raw IQ is less useful than “invested intelligence.” Focus on deep-domain expertise (e.g., learning a new language or complex technical skill). This leverages the “Industriousness” personality trait to maximize your genetic potential [5].
2. Mitigate Testing Anxiety: If you are using your intelligence in academic or professional settings, be aware that anxiety directly impairs test performance. Developing “stress tolerance” allows your true cognitive ability to surface [5].
3. Optimize Health for Brain Maintenance: High IQ correlates with survival because it aids health decisions [2]. Use your cognitive resources to automate healthy habits (exercise and nutrition) early, as education alone won’t stop natural age-related brain changes later [4].
4. Practice Open-Mindedness: Actively seek out contradictory evidence for your most cherished beliefs. This replicates the “actively open-minded thinking” trait found in high-IQ populations and improves decision-making quality [1].

• Longevity: Higher intelligence is a statistically significant predictor of a longer life, primarily due to better health self-management.
• Stability: Intelligence is highly stable from age 20 into late adulthood, but early-life intervention is critical for setting the baseline.
• Education: Schooling increases brain volume and memory capacity, providing a higher starting point for aging, though it doesn’t halt the eventual rate of decline.
• Personality: Traits like industriousness and intellectual curiosity are the most effective “multipliers” of raw intelligence.
• Action Plan: Focus on building a “cognitive reserve” through education, managing stress to unlock performance, and using planning skills to align time usage with personal values.

Intelligence is more than a score on a test; it is an engine for life management. By understanding how it interacts with health and personality, you can leverage your cognitive strengths to live a longer, more deliberate, and more open-minded life.