Heart disease remains one of the biggest health threats in the world. Millions of people die each year from heart attacks, strokes, heart failure, and other cardiovascular problems.
Doctors have long known that smoking, poor diet, obesity, lack of exercise, diabetes, and high blood pressure can damage the heart and blood vessels.
However, researchers are now learning that mental and emotional health may also play a major role in protecting the heart.
A new study led by researchers at the University of Illinois Urbana-Champaign suggests that simple positive psychology activities such as mindfulness, gratitude journaling, and optimism training may improve heart health within just a few weeks.
The study was published in the journal Cardiology Clinics. Researchers reviewed 18 randomized controlled trials, which are considered one of the strongest forms of medical research.
The studies involved adults with elevated cardiovascular risk factors such as uncontrolled high blood pressure, heart failure, or a history of heart disease.
Positive psychology focuses on improving emotional well-being by strengthening positive emotions, thoughts, and behaviors. Instead of concentrating only on illness or stress, these approaches encourage practices such as gratitude, mindfulness, hope, optimism, and positive social connection.
Mindfulness programs often teach people how to focus attention on the present moment while calmly observing thoughts and emotions without judgment.
Gratitude journaling encourages people to regularly write down positive experiences or things they appreciate. Optimism training helps people develop more hopeful ways of thinking about challenges and the future.
Researchers found that these programs consistently improved several important markers linked to heart disease risk. In particular, mindfulness-based programs lasting around eight weeks helped reduce systolic blood pressure, which is the top number in a blood pressure reading.
Some programs also lowered inflammatory markers in the blood, including high-sensitivity C-reactive protein and fibrinogen. Inflammation is believed to play a major role in the development of heart disease because it can damage blood vessels over time.
One of the strongest results came from a 12-week digital spirituality-based program. Participants experienced an average reduction of 7.6 points in systolic blood pressure measured with a standard blood pressure cuff.
Researchers also found improvements in central systolic pressure, which reflects pressure in the large artery leaving the heart.
The study included a variety of different program formats. Some used in-person group sessions, while others relied on phone calls, apps, text messaging, online platforms, journaling exercises, or hybrid approaches combining several methods.
Most programs lasted between six and 12 weeks and included regular weekly sessions along with daily activities that participants practiced at home.
Researchers noticed that programs involving more frequent contact and reinforcement produced the most consistent improvements. Daily practice combined with weekly support sessions appeared especially effective.
One program delivered through WhatsApp produced particularly strong behavior changes. Participants received weekly sessions along with small daily tasks designed to encourage healthier habits. This program helped people become more physically active, improve their diet, and take medications more consistently.
Another intervention using motivational interviewing increased physical activity levels by about 1,800 extra steps per day among cardiac patients.
The findings suggest that positive psychology may help heart health partly by encouraging healthier lifestyle habits. People who feel more hopeful, motivated, calm, and emotionally supported may be more likely to exercise, eat well, manage stress, and follow medical advice.
Researchers explained that the effects may not come only from emotional improvement itself, but also from the healthier behaviors that follow.
Rosalba Hernandez, the lead researcher and a professor of social work at the University of Illinois Urbana-Champaign, said that ongoing support may be important for maintaining long-term benefits.
The researchers found that the strongest improvements happened when participants practiced these skills daily for eight to 12 weeks with regular reinforcement. However, maintaining healthier behaviors over time may require continued lower-intensity support afterward.
The study also highlights the growing connection between mental health and physical health. Scientists increasingly believe that emotional well-being, stress levels, and social support may directly affect the cardiovascular system.
Previous studies have already shown that chronic stress, anxiety, loneliness, and depression can raise blood pressure and increase inflammation. On the other hand, optimism, gratitude, and positive emotions may help protect the heart.
The researchers say these findings support the idea that healthcare systems should pay more attention to emotional well-being when treating heart disease and preventing cardiovascular problems.
The study also builds on earlier research led by Hernandez showing that optimistic people tend to have healthier hearts.
After reviewing the findings carefully, the study appears important because it combines evidence from multiple high-quality clinical trials rather than relying on a single small experiment.
The results consistently suggest that positive psychology and mindfulness practices may improve both emotional and cardiovascular health. However, many of the improvements may partly result from healthier behaviors such as increased exercise and better medication adherence rather than direct psychological effects alone.
More long-term studies are still needed to determine how lasting these benefits are. Even so, the findings strongly suggest that mental and emotional health should be considered an important part of heart disease prevention and treatment.
If you care about heart health, please read studies about top 10 foods for a healthy heart, and how to eat right for heart rhythm disorders.
For more health information, please see recent studies about how to eat your way to cleaner arteries, and salt and heart health: does less really mean more?
Source: University of Illinois Urbana-Champaign.
