Mind and heart: what 18 trials actually show

A gratitude journal is not a blood-pressure drug. The more useful scientific question is whether structured psychological practices can add a measurable benefit to cardiovascular care. Rosalba Hernandez, a social work professor at the University of Illinois Urbana-Champaign, and colleagues reviewed 18 randomized controlled trials — studies that assign participants by chance to an intervention or comparison group — to look for an answer.

The team examined positive-psychology programs, which train resources such as optimism, gratitude and favorable emotions, and mindfulness, the practice of attending to present experience with less judgment. Delivery included telephone sessions, supported journaling, apps, messages and groups. Trials generally enrolled 50 to 200 adults with elevated cardiovascular risk, often in their late 50s to mid-60s; women made up 35% to 55% of samples in studies reporting gender.

The findings cannot be reduced to one number because this was a narrative review, not a meta-analysis that calculates a pooled average effect. Even so, eight-week mindfulness programs lowered systolic blood pressure — pressure while the heart contracts — and inflammatory markers. One 12-week digital spirituality program lowered arm-cuff systolic pressure by 7.6 millimeters of mercury and central pressure in the aorta by 4.1; those numbers come from one trial, not a promise for every person.

On behavior, an eight-week WhatsApp program paired weekly meetings with daily microtasks and improved physical activity, diet and correct medication use. Another program used motivational interviewing — a structured conversation that strengthens a person's own decision to change — and added about 1,800 steps a day while improving medication adherence. The most consistent pattern linked daily practice, weekly reinforcement and eight to 12 weeks of participation.

Hernandez co-authored the Cardiology Clinics review with Soonhyung Kwon, Alyssa M. Vela and Katharine S. Edwards. Sharita Forrest wrote the University of Illinois account; ScienceDaily names no individual reporter. The Italian site The Wom Healthy likewise gives no individual byline but identifies Roberto Gindro as scientific reviewer. These sources contextualize the paper without turning a heterogeneous synthesis into clinical instructions.

The evidence supports short-term improvements in blood pressure, inflammation or health behavior from some structured programs among adults already at cardiovascular risk. It does not show that positive thinking prevents heart attacks, that gains persist, or that mindfulness replaces medication, exercise or medical care. The work matters because it brings mental health into heart care; the decisive uncertainty is whether larger, standardized and longer trials reproduce the effects and improve lasting clinical outcomes.