Culturally Tailored "Food-is-Medicine" Intervention Dramatically Lowers Blood Pressure in Black and Hispanic Adults
A new study, presented at the American College of Cardiology's Annual Scientific Session (ACC.26), reveals a significant decrease in blood pressure among Black and Hispanic adults with high blood pressure who engaged in a culturally tailored food-based intervention. This intervention, which included dietitian coaching, showed a greater reduction in blood pressure compared to those who only received fresh produce.
The study further highlighted that the drop in blood pressure doubled in individuals demonstrating stronger adherence to the Dietary Approaches to Stop Hypertension (DASH) diet. The DASH diet emphasizes fruits, vegetables, nuts, whole grains, and lean proteins, while restricting salt, sugar, saturated fats, and processed foods.
"Simply advising dietary changes is insufficient. The intervention aimed to provide prescribed foods, facilitate preparation reflecting cultural preferences, and coach participants to sustain changes."
— Oluwabunmi Ogungbe, PhD, assistant professor at Johns Hopkins
Understanding the Challenge of Hypertension
Hypertension, or high blood pressure, affects nearly half of all U.S. adults and is a leading contributor to heart disease. While diet is a critical factor in reducing heart disease risk, many individuals with hypertension struggle to maintain heart-healthy, low-sodium diets. "Food-is-medicine" programs are expanding nationwide, yet evidence regarding their most effective implementation often remains limited.
Study Design and Participants
Researchers conducted a pilot trial involving 80 adults with hypertension in Maryland communities where access to fresh produce can be challenging. Participants were, on average, 55 years old, with 62% identifying as Black and 34% as Hispanic. Crucially, the program was co-designed with community members to ensure it aligned with their specific needs and cultural preferences.
Half of the participants received the multi-pronged food-is-medicine intervention, while the control group received weekly produce bags of equivalent value ($30) along with basic nutrition messages. Blood pressure measurements were taken at the start of the study (baseline) and again after 24 weeks.
The Intervention's Approach
Participants in the intervention group met bi-weekly with a dietitian for personalized meal planning and heart-healthy diet strategies. Efforts were made to match dietitians with participants from similar cultural backgrounds when possible. Unlike the control group, who received home deliveries, the intervention group picked up produce from a mobile farm stand, allowing for substitutions based on preference. They also received AI-optimized messages for ongoing encouragement.
Key Findings: Significant Blood Pressure Reduction
After 24 weeks, the intervention group demonstrated a significantly greater reduction in systolic blood pressure, averaging 6.8 mm Hg, compared to a mere 0.3 mm Hg reduction in the control group.
For intervention participants who showed high adherence to the DASH diet, the average reduction was an impressive 13.3 mm Hg.
This level of change surpasses improvements seen with some blood pressure-lowering medications, though larger studies are needed for confirmation.
Actionable Insights and Future Directions
Dr. Ogungbe emphasized that this information provides actionable insights for clinicians, underscoring the vital role of comprehensive support systems. These include access to affordable healthy foods, building confidence in cooking, providing culturally aligned guidance, and consistent encouragement. At a policy level, the study contributes valuable evidence for the effectiveness and implementation of "food-is-medicine" programs.
Limitations and Important Clarifications
As a pilot study, it has limitations, including its small sample size, limited statistical power, and restricted geographic range. Further larger studies are essential to explore broader feasibility, optimal intervention duration, applicability in diverse communities, relevance for specific patient groups, and overall cost-effectiveness.
Dr. Ogungbe also clarified that food-based interventions complement, but do not replace, blood pressure-lowering medications when appropriate.
The study was funded by the American Heart Association's Healthcare by Food initiative. The findings were presented by Dr. Ogungbe at the American College of Cardiology's Annual Scientific Session.