This Is the Thing That Actually Makes People Happy, According to Research

Most people, if pressed, could produce a mental list of everything standing between them and being happy. More money. A better body. A different job. A bigger apartment. The list is long, and the goalposts keep moving, which is how it was always designed to work.

The problem is that none of it holds up under scrutiny. Research published in Psychology Today points out that income accounts for roughly 2% of the variance in happiness between people—so, basically, money means nothing when it comes to happiness. Dieting fares even worse: studies have found it can actively pull happiness down rather than push it up.

What does predict happiness, by a considerable margin, is something far less marketable than a pay raise or a wellness routine. According to the Harvard Study of Adult Development—now in its 87th year and still the longest-running scientific study of its kind—the quality of a person’s relationships is the single strongest predictor of happiness and health across an entire lifetime. The study, which began in 1938 and eventually expanded to more than 2,500 participants including spouses and descendants, found that people with strong, supportive relationships were happier, healthier, and lived longer than those without them. Relationship satisfaction at age 50, researchers found, was a better predictor of physical health in later life than cholesterol levels.

The Biggest Predictor of Happiness Isn’t Money, Looks, or a Better Job

That’s not a soft finding. That’s a data point that should probably make people rethink how they’re spending their weekends.

There’s also compelling evidence that doing things for other people produces its own returns. A 2019 study tracked participants who either performed good deeds for others or practiced conventional self-care—nice meals, movies, that kind of thing—over ten days. Both groups got a boost. Where they diverged was in what that boost felt like—the good-deed participants reported greater social connection and a more pronounced sense of purpose than those who’d focused on themselves. The biology behind it involves dopamine: altruistic behavior lights up the brain’s reward system, and researchers have linked trait altruism to the D4 dopamine receptor. Doing something for someone else feels good because the brain was wired to make it feel that way.

Self-improvement isn’t the enemy here. The issue is the hierarchy. The cultural obsession with individual optimization—the tracking, the optimizing, the relentless personal project of becoming a better version of yourself—might be addressing the wrong problem. Research comparing people who pursued social goals versus personal growth goals found that those investing in their relationships reported greater gains in happiness than those focused on changing themselves.

Eight-plus decades of data, and the answer hasn’t changed. People are chronically wrong about what will make them happy—and they’re paying for it.