Summary: A large new study shows that seven days of brief, daily acts of kindness and gratitude can meaningfully boost emotional well-being. In the web-based Big Joy Project, nearly 17,600 participants worldwide completed short micro-activities—such as asking someone to share a joyful moment, listing things they are grateful for, or performing a small kind act—and reported measurable improvements in mood, stress and sleep.
The intervention produced higher positive emotions, reduced perceived stress, and better self-reported sleep and health. Benefits were especially pronounced among younger participants and those from Black, Hispanic, or socially disadvantaged backgrounds, suggesting this low-cost, low-burden approach could promote equity in mental health and well-being.
Key facts
- Brief and effective: Only a few minutes per day for seven days produced significant improvements in well-being, stress and sleep quality.
- Equitable impact: Younger adults and people who identified as Black, Hispanic, or socially disadvantaged gained the largest benefits.
- Scalable model: The minimal daily time commitment makes the program accessible for broad populations and easier to scale digitally.
Source: UCSF
Study overview: Led by researchers at the University of California, San Francisco, the Big Joy Project tested a weeklong, web-based well-being intervention made up of daily micro-acts. Activities were intentionally simple and fast: prompting someone to share a proud, inspiring or fun moment; writing a short gratitude list; or doing a small kindness to cheer up another person. The goal was to lower barriers to participation—time, cost and motivation—while still producing clinically meaningful benefits for mental and physical health.
The online convenience sample included approximately 17,600 people from 169 countries and territories. Most participants were from the United States, Canada and Great Britain (71%), and the overall sample skewed female (84%), White (74%), and highly educated (94% reported at least some college education).
What the researchers found
- After completing the seven-day program, participants reported increased emotional well-being, more frequent positive emotions, and greater belief in their ability to generate happiness through everyday actions. They also reported reduced perceived stress and modest improvements in self-rated health and sleep quality.
- There was a dose-response relationship: participants who engaged in more of the daily practices experienced larger improvements.
- Sociodemographic moderators were evident: people with indicators of social disadvantage—lower education, greater financial strain, lower subjective social status—or those identifying as Black or Hispanic experienced larger benefits than more advantaged groups. Younger participants also showed greater improvements in well-being and greater reductions in stress compared to older participants.
Why this matters
- Higher emotional well-being is linked to better long-term mental and physical health. As the study’s senior author notes, people with higher well-being are less likely to develop chronic conditions such as cardiovascular disease and tend to have lower mortality risk.
- Many digital well-being programs require several weeks and several hours per week, which limits reach and increases dropout. This study is the first large-scale demonstration that a very brief, low-burden intervention—just minutes a day for a week—can produce benefits comparable to longer programs and may better engage people who lack time or resources.
“Many people lack the time, motivation, and resources to commit to lengthier programs, and they may be more likely to drop out,” said Darwin Guevarra, PhD. “We were excited to see positive results from a program that required just a few minutes each day for a week.”
Funding and disclosures: Individuals named Smith and Callahan are affiliated with the nonprofit organization that partially funded the Big Joy Project.
About this happiness and psychology research news
Author: Suzanne Leigh, UCSF
Source: UCSF
Contact: Suzanne Leigh – UCSF
Image: Image credited to Neuroscience News
Original research (open access): “Scaling a Brief Digital Well-Being Intervention (the Big Joy Project) and Sociodemographic Moderators: Single-Group Pre-Post Study” by Elissa Epel et al. DOI: 10.2196/72053. Published in the Journal of Medical Internet Research.
Abstract
Title: Scaling a Brief Digital Well-Being Intervention (the Big Joy Project) and Sociodemographic Moderators: Single-Group Pre-Post Study
Background: Interventions that improve emotional well-being can also improve mental and physical health outcomes. Historically, many interventions were tested in fairly homogeneous groups and required substantial participant time, limiting accessibility and generalizability. To address these problems, the research team developed a brief, web-based intervention designed to be low-burden and broadly accessible.
Objective: The study evaluated whether a short, low-intensity digital well-being program can improve emotional well-being and related health outcomes across a diverse international sample. It also examined how sociodemographic factors—age, sex, race and ethnicity, education, financial strain, and subjective social status—moderate intervention effects to identify which groups benefit most.
Methods: From 2022 to 2024, researchers ran a single-group pre-post study of a weeklong online intervention requiring about 5–10 minutes per day. Using open web-based enrollment, they measured changes in emotional well-being, positive emotions, happiness agency, perceived stress, self-reported health, and sleep quality. Mixed-effects linear models evaluated pre-post changes and examined sociodemographic moderators.
Results: The sample (N = 17,598) included participants from 169 countries and territories, with broad sociodemographic diversity though a predominance of White, female, and college-educated respondents. After the intervention, participants showed moderate within-subject increases in emotional well-being, positive emotions, and happiness agency, and reductions in perceived stress. Small but significant improvements were seen for self-reported health and sleep quality. Greater practice engagement yielded larger gains. Socially disadvantaged groups and younger participants experienced larger benefits across most outcomes.
Conclusions: A brief, low-intensity digital intervention produced meaningful improvements in well-being and stress comparable to longer programs, with particularly strong benefits for groups at higher risk for poor mental health. These findings support the potential for scalable public health impact; randomized controlled trials are recommended as a next step to confirm efficacy.