We’ve all felt that warm glow after holding the door for a stranger, dropping a meal off for a grieving neighbor, or slipping a few extra dollars into a tip jar. A new study published in the Journal of Positive Psychology confirms that feeling is real — and goes a lot deeper than most of us realize.
The study tested three methods of cognitive behavioral therapy to see which was most effective at reducing depression and anxiety: planning enjoyable activities, “cognitive reappraisal” (a technique where people record and challenge their negative thoughts), and random acts of kindness — things like buying a stranger’s coffee or baking cookies for a neighbor. Researchers expected cognitive reappraisal to win. It’s the approach with the strongest clinical track record, and they were banking on it.
“We did think that, if there was going to be an advantage of one group over another, it might be the thoughts record group, since that’s such a tried-and-true way of addressing depressive and anxiety symptoms,” said Jennifer Cheavens, who co-authored the study. “But the kindness group did as well or better, and that group also had increases in social connection that didn’t happen in the other two groups.”
The kindness group didn’t just hold its own — it outpaced the others in ways researchers hadn’t predicted. And the biology behind why is worth understanding.
When you do something kind, your brain undergoes a real biochemical shift. “Kindness can positively change your brain,” says psychiatrist Dr. Steve Siegle of the Mayo Clinic. “Being kind boosts serotonin and dopamine, which are neurotransmitters in the brain that give you feelings of satisfaction and well-being, and cause the pleasure/reward centers in your brain to light up.” The same reward circuitry that responds to your favorite meal or a song you love also responds to generosity — but the effects tend to be more durable.
Researchers have identified a cluster of neurochemicals behind what’s sometimes called the “helper’s high.” Dopamine creates that euphoric, energized feeling during and after a kind act. Serotonin stabilizes mood over time. Oxytocin — the so-called “love hormone” — is released through positive social contact and functions as a cardioprotective agent, actively lowering blood pressure and regulating heart rhythm. Endorphins, the body’s natural painkiller, also get released through compassionate acts, which is part of why kindness-based interventions have shown promise in chronic pain management.
The effects don’t stop at the brain. Acts of kindness stimulate the vagus nerve — the longest nerve in the body — which regulates heart rate and produces a state of calm and resilience. Kindness also suppresses cortisol, the stress hormone linked to tissue damage, cardiovascular strain, and immune suppression. Studies show that people with high levels of positive social connection produce more antibodies, recover faster from illness, and respond better to vaccines. Compassionate practices have shown increased immune-related gene activity and decreased inflammation markers.
The longevity data is hard to ignore. Longitudinal studies show that people with generous habits and strong social ties live longer than socially isolated individuals. One study found that older adults who provided support to others had a significantly lower risk of dying over a five-year period compared to those who didn’t — echoing other research showing that social isolation is as damaging as smoking 15 cigarettes a day.
Dr. Waguih William IsHak at Cedars-Sinai notes that a single kind act only provides a 3-to-4-minute oxytocin boost. The real benefit comes from making kindness habitual. “Practicing kindness toward others is one we know works,” he says, describing consistent kindness as one of the most reliable pathways to sustained happiness. Research from Harvard also suggests that concentrating kind acts — performing five selfless deeds on one day each week rather than spreading them out — may produce stronger well-being benefits than a scattered approach.
Part of what makes kindness so effective is that it forces you out of yourself. Performing kindness helps people shift focus away from their own symptoms, which provides relief not by suppressing difficult feelings, but by expanding perspective. The Ohio State study found that only the kindness group saw meaningful increases in social connection — not the other two therapy methods. That’s not incidental to kindness working; it’s the mechanism.
Tyler VanderWeele, co-director of the Initiative on Health, Spirituality, and Religion at Harvard T.H. Chan School of Public Health, defines kindness as “trying to contribute something positive or good to another person, but also being disposed to do so — wanting good for them.” The disposition matters as much as the action. And the effects extend further than the moment: when you act kindly toward someone, VanderWeele notes, “there’s also a propagation effect — that person goes on to act more kindly.” People who receive acts of kindness become measurably more likely to be generous themselves.
Researchers have also found a consistent gap between how givers and receivers experience the same act. Givers tend to underestimate the impact of their gestures significantly, while receivers perceive much greater value — not just in the thing or action itself, but in what it communicates about being seen and cared for. We’re generally worse than we think at predicting the good we can do for someone else.
None of this would come as news to people of faith. The call to kindness runs through virtually every spiritual tradition, and in Christianity it sits close to the center of what it means to reflect the character of God. The Apostle Paul didn’t frame “be kind to one another” as a lifestyle tip — he framed it as a mirror of divine action: “Be kind to one another, tenderhearted, forgiving one another, as God in Christ forgave you” (Ephesians 4:32). Kindness, in this vision, isn’t just something we do. It’s something we become, and something we witness to.
Scripture calls kindness a fruit of the Spirit — not a discipline built through effort, but a natural outgrowth of a life rooted in grace. Contemporary neuroscience ends up confirming something that vision already implied: kindness isn’t a drain on the self. It’s generative. It produces more in the person giving it than it costs them.
There’s a story in 2 Samuel that captures this well. King David shows radical generosity toward Mephibosheth — someone with no claim on his favor — and calls his own compassion “the kindness of God.” The implication is that human generosity is meant to echo divine mercy. We give because we’ve been given to. The Harvard Initiative on Health, Spirituality, and Religion has compiled compelling evidence that kindness is tied to multiple dimensions of health and well-being. For people of faith, the commandment to love your neighbor also happens to be good medicine.
The research doesn’t ask you to be a hero. Buy someone’s coffee. Check on a friend you’ve been meaning to reach out to. Drop a meal off. Leave a generous tip. Actually listen when someone tells you how they’re doing. The acts don’t have to be grand — the study that outperformed clinical therapy was built on things as simple as baking cookies for a neighbor. The science and the faith tradition are saying the same thing: we were made for this. And when we live like it, something in us comes alive.
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