The Science Behind Happiness
Posted 30 Jul 2026
by Chayanoot Pungcharoenpong, Ph.D., ACC
What makes people happy? Explore the science of happiness and discover psychology-backed insights into the key factors that support lasting well-being.
Lesson One: Happiness Is Not Fully Determined by Genetics and Biology
Studies in psychology and neuroscience suggest that genetics do influence happiness, but they do not determine it completely. Research by Lyubomirsky, Sheldon, & Schkade indicates that roughly half of individual differences in happiness may be linked to genetic factors, while life circumstances account for only a small portion. The remaining variation is associated with intentional activities such as daily habits, cognitive patterns, relationships, and personal choices. [1]
Neuroscientific research also reveals that brain systems and neurochemicals—including dopamine, serotonin, and oxytocin—play important roles in regulating emotion and well-being. [2] However, findings consistently show that happiness is not fixed. It can change over time in response to behavioral and environmental factors. Positive habits, supportive social environments, meaningful relationships, and healthy lifestyles have all been associated with increases in well-being. [3][4][5]
At the same time, there is no universal formula for happiness, as individuals differ in personality, life experiences, and contextual factors. All in all, contemporary research suggests that happiness is shaped by an interaction between biological predispositions and life experiences, implying that people often have more influence over their well-being than they may assume. [6]
Lesson Two: Happy People Can Feel Sad Too
Research discloses that people often experience happiness and sadness separately in everyday life. However, during important life events—like graduating, leaving college, or watching emotional movies—people can feel both happy and sad at the same time. This suggests that mixed emotions are normal during meaningful moments. [7]
Another study of 222 college students compared the happiest 10% with average and unhappy students. The super happy students had strong friendships and romantic relationships, rarely thought about suicide, and remembered many more positive events than negative ones. They also reported more positive emotions than negative ones in daily life.
However, they did not differ much from average students in areas like money, grades, physical appearance, exercise, religion, or the number of good or bad life events they experienced. These factors did not strongly explain who was happiest.
Even the notably happy students were sometimes unhappy. They still experienced neutral and negative moods occasionally. On about half the days, they felt some negative emotion, but very intense negative moods were rare. Their average mood score was 7.7 on a 10-point scale, meaning they generally felt “mildly happy” to “feeling good.”
Overall, the members of the happiest group experienced positive, but not ecstatic, feelings most of the time, along with occasional negative moods. This suggests that very happy people have a healthy, functioning emotional system that responds normally to life experiences. [8]
Lesson Three: Money Does Not Always Buy Happiness
Research reveals that income can improve well-being, but it is not enough on its own. Relationships, meaning, and social conditions are just as important for true happiness. A 2010 study found that income and education are more strongly linked to how people evaluate their lives overall, while daily emotions are more influenced by factors such as health, loneliness, caregiving, and smoking. Money improves life satisfaction, but emotional well-being increases with income only up to about $75,000 per year, after which it levels off. [9]
Similarly, a survey from 2012 supports the idea that money can bring comfort, freedom, and security but does not always lead to greater happiness. Many wealthy people focus more on family, purpose, and meaning than on earning more money. In some cases, high wealth can also create challenges such as anxiety about their children, feelings of isolation, and stress caused by having too many choices. [10]
More current findings in 2025 continue this pattern, showing that national happiness depends not only on wealth but also on how effectively countries convert resources into well-being. A study using wealth-adjusted life satisfaction found that some lower-income countries score higher than expected in well-being, while some wealthier countries score lower. The study also identified key factors linked to higher happiness, including job quality, personal freedom, social connections, volunteering, and community engagement. Countries with strong community values, religion, and prosocial behavior tend to make better use of limited resources to support well-being. [11]
In general, the evidence indicates that wealth alone does not determine happiness; instead, social relationships, meaningful work, and strong communities play a central role in both individual and national well-being.
Lesson Four: Achievement and Success Do Not Guarantee Happiness
The pleasure derived from success and achievement often produces only temporary increases in happiness because people gradually adapt and return to a relatively stable emotional baseline. [12] Studies by Brickman, Coates, & Janoff-Bulman in 1978; Lucas, Clark, Georgellis, & Diener in 2003; Lucas & Clark in 2006; and Boswell, Boudreau, & Tichy in 2005 show that the emotional benefits of events such as lottery wins, marriage, or job promotions typically diminish within months or a few years. [13][14][15][16]
However, research by Sonja Lyubomirsky, Kennon Sheldon, and David Schkade suggests that practices like gratitude and appreciation can slow this adaptation by helping people sustain attention to positive experiences. In contrast, continually pursuing more achievement or pleasure may raise expectations faster than satisfaction, weakening long-term happiness. [17]
Supporting this result, experimental evidence shows that temporarily giving up a pleasurable experience can increase later enjoyment. In a chocolate consumption study, participants who abstained for a week reported greater savoring and more positive mood when they later consumed chocolate than those who did not abstain. This suggests that brief self-denial can enhance well-being by counteracting hedonic adaptation. [18]
In sum, these results from these studies suggest that happiness does not depend solely on positive experiences such as success or achievement; rather, it is also sustained through daily practices such as gratitude, appreciation, and occasional self-denial of pleasurable experiences.
Lesson Five: Happiness Can Lead to Success
Society often assumes that success leads to happiness, but research suggests the reverse can also be true: happiness may contribute to success. A meta-analytic review by Sonja Lyubomirsky, Laura King, and Ed Diener in 2005, drawing on cross-sectional, longitudinal, and experimental studies, found that people who experience frequent positive emotions tend to have better relationships, stronger work performance, higher incomes, better health, greater creativity, and more prosocial behavior. Positive emotions also promote desirable behaviors and thinking such as optimism, sociability, energy, resilience, and altruism, which help individuals thrive and achieve success over time. [19]
More recent evidence in 2023 from cross-sectional, longitudinal, and experimental research consistently demonstrates that happiness connects with greater career success. Cross-sectional findings show that happier employees report more meaningful work, higher job satisfaction, better performance, stronger relationships, higher income, and lower burnout and absenteeism. Longitudinal studies suggest that happiness often comes before success, predicting later job attainment, performance, productivity, earnings, and workplace commitment. Experimental studies further show that inducing positive emotions improves confidence, goal-setting, persistence, creativity, cooperation, negotiation, and task performance.
Collectively, the evidence suggests that well-being is not only associated with success but can also help cause it by shaping motivation, cognition, and behavior. However, it does not mean negative emotions are always harmful or that unhappy individuals cannot succeed, as negative emotions can be adaptive depending on context. Moreover, success depends on multiple factors, such as intelligence and conscientiousness. Happiness is one important contributing element. [20]
Taken together, the research provides evidence that happiness plays an important role in supporting success across various domains of professional and personal life.
Lesson Six: Overtrying to Be Happy Can Backfire
The academic review by Gruber, Mauss, and Tamir challenges the common assumption that happiness is always beneficial. Their work highlights that happiness can have a “dark side” when people experience or pursue it in maladaptive ways. [21] These include:
- Wrong degree: Excessively intense or prolonged happiness may reduce creativity, increase risk-taking, and become psychologically maladaptive.
- Wrong context: Positive emotions are not always appropriate or functional; in situations involving danger, conflict, or loss, negative emotions may support more adaptive responses.
- Wrong types: Certain forms of happiness, such as excessive pride, may negatively affect interpersonal relationships and social functioning.
- Wrong pursuit: The constant striving for happiness may paradoxically reduce well-being, whereas accepting a full range of emotional experiences, including negative emotions, is often more adaptive.
Research by Humphrey, Szoka, and Bastian further supports this idea. Across two studies involving 496 participants, the researchers found that placing too much value on being happy all the time was linked to depression, lower life satisfaction, stronger negative emotions, and rumination. This occurred partly because individuals began to view negative emotions as unacceptable or as personal failures. [22]
In contrast, “prioritizing positivity”—focusing on activities that naturally promote happiness—was associated with better mental health and greater life satisfaction. [22] Taken as a whole, the evidence points to the conclusion that psychological well-being improves when people accept both positive and negative emotions rather than constantly trying to feel happy all the time.
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