What reliably improves wellbeing (and what doesn't)

People, movement, sleep and time outdoors have the best evidence. Many famous psychology tricks have small effects or didn't replicate.

• Evidence: Some

What has good evidence

People. Close relationships are the most consistent finding in wellbeing research. In a meta-analysis of 148 studies with over 300,000 people, those with stronger social relationships were 50% more likely to survive over the study periods [1]. That’s an association, not proof of cause, but it held across ages and health levels. The Harvard Study of Adult Development has followed people for decades. In one of its studies of older couples, feeling secure with a partner predicted greater life satisfaction two and a half years later [2]. See Being social as an introvert for a practical start.

Movement. A meta-analysis of studies in healthy people found a small but real link between physical activity and wellbeing. It showed up in experiments as well as surveys, and it didn’t depend on being fit to begin with [3]. The effect was mainly on positive feelings: more good moods, rather than fewer bad ones. For a training plan, see liftgood.now.

Sleep. Combining 64 studies, losing sleep had a large effect on positive mood and a moderate effect on negative mood [4]. Those were lab studies that cut sleep on purpose, but the direction is clear. sleepgood.now covers how to sleep better.

Time outdoors. In a survey of almost 20,000 adults in England, people who spent at least 120 minutes a week in nature were more likely to report good health and high wellbeing. The benefit leveled off around 200 to 300 minutes. It didn’t matter whether the time came in one visit or several [5]. That’s a survey, so it can’t prove the nature caused the difference.

What has some evidence, with smaller effects

• Money, up to a point and beyond. Happiness rises with income for most people, but each step needs a proportionally bigger raise. For the least happy fifth of people, it levels off above about $100,000 a year [6].
• Spending on other people. A large preregistered replication found that spending on others makes people a little happier than spending on themselves, but the effect was small, and one of its three experiments found nothing [7].
• Positive psychology exercises such as gratitude letters and “three good things”. A meta-analysis of 39 trials found small benefits that lasted a few months [8]. A re-analysis that corrected for small studies with inflated results found the effect on wellbeing was smaller still [9]. They’re worth trying, but don’t expect them to transform your mood.

What doesn’t hold up

• Power posing. The idea that two minutes in a confident pose changes your hormones failed to replicate. A study of 200 people found no effect on hormones or behavior, only on how powerful people said they felt [10].
• Ego depletion, the idea that willpower is a tank that runs out. Two large replications, across 23 and 36 labs, found effects close to zero [11][12].
• Venting anger, such as hitting a pillow or “letting it out”. A meta-analysis of 154 studies found that activities that raise arousal didn’t reduce anger, while calming ones like slow breathing did [13].
• Chasing happiness hard. In small studies, people who were pushed to value happiness highly enjoyed a happy film less, apparently because they were disappointed with how they felt [14]. Aim for a good week, not a happy feeling.

What this means for you

Start with the Foundations: sleep, movement, daylight, food, people. Then use Situations for specific moments. Be wary of any quick fix that promises big changes, including on this site. Every page here tells you how strong its evidence is.

Rated Some overall. The evidence for relationships, activity, sleep and nature is large but mostly observational. The trials of specific exercises show small effects.

Topics: About This Site, Evidence, Relationships, Exercise, Nature, Sleep

Sources checked 4 October 2026. Spot a mistake? Tell us.