Food-as-Medicine Program Shows Blood Pressure Improvements in High-Risk Adults
A new study suggests that combining free produce with personalized nutrition coaching may help lower blood pressure in certain high-risk adults—especially those who are already motivated to eat healthy. The research, called the THRIVE program, focused on Black and Hispanic adults living in neighborhoods with limited access to fresh food, known as “food deserts.”
While the program did not significantly improve overall diet quality across the entire group, it did show a meaningful drop in systolic blood pressure—the top number in a blood pressure reading—among participants who stuck closely to the DASH diet. This finding adds to the growing “food-as-medicine” movement, which aims to use nutrition as a tool to prevent and manage chronic diseases.
What the THRIVE Study Found
The study was a small, randomized pilot trial involving 80 adults living in food deserts in Maryland. Researchers wanted to see if a more intensive food-as-medicine approach could improve diet quality and lower blood pressure compared to simply giving people free fruits and vegetables.
The intervention group received weekly bags of fresh produce, plus tailored dietary coaching designed to help them follow the DASH (Dietary Approaches to Stop Hypertension) diet. The control group—called “enhanced usual care”—also received bags of produce and links to social resources, but no personalized coaching or prescriptions for healthy food.
After 24 weeks, researchers measured the participants’ diet quality using the DASH score, which ranges from 0 to 9. A higher score means closer adherence to the heart-healthy DASH diet. The average DASH score for the intervention group was 4.1 out of 9, compared to an average of 3.8 at the start. However, the difference between the intervention group and the control group was only 0.5 points, which was not statistically significant. In plain terms, the overall diet quality did not improve much more in the group that received coaching than in the group that just got free produce.
But the real story emerged when researchers looked at blood pressure.
Among participants who already had high DASH adherence at the start (a score above 4.5), those in the intervention group saw their systolic blood pressure drop by an average of 13.3 mm Hg over 24 weeks. In contrast, similar high-adherence participants in the control group saw their blood pressure rise by 2.0 mm Hg. This difference was statistically significant, meaning it was likely not due to chance.
For participants with low baseline DASH adherence (scores below 4.5), the blood pressure changes were much smaller: a drop of 2.4 mm Hg in the intervention group versus a drop of 1.1 mm Hg in the control group.
Why This Matters for Your Health
High blood pressure, or hypertension, affects about 1 in 2 adults in the United States. It is often called the “silent killer” because it usually has no symptoms but can lead to serious health problems like heart disease, stroke, and chronic kidney disease (CKD). According to the study’s lead author, Dr. Elohor Oborevwori of the Johns Hopkins School of Nursing, hypertension is the number one modifiable risk factor for cardiovascular disease and CKD.
The condition disproportionately affects Black adults, who have a prevalence rate of 59%. This is significantly higher than in other racial and ethnic groups. Black adults also face higher rates of food insecurity and often lack access to culturally appropriate healthcare. The THRIVE study specifically recruited Black and Hispanic participants to address these disparities.
The DASH diet is widely recommended by doctors and health organizations for lowering blood pressure. It emphasizes whole foods like vegetables, fruits, whole grains, lean proteins, and low-fat dairy, while limiting sodium, sugar, and saturated fats. Beyond blood pressure, research has linked the DASH diet to lower risks of early death and cognitive decline.
However, sticking to the DASH diet can be challenging, especially for people with limited income or who live in food deserts—areas where grocery stores with fresh produce are scarce. A similar study from last year found that delivering DASH-style groceries to Black adults in food deserts helped lower blood pressure, but the benefits faded once the deliveries stopped.
Who Was in the Study?
The THRIVE trial recruited 80 participants from churches, food distribution centers, and clinics in Maryland. The group was diverse and faced significant challenges:
– 62% were Black participants
– Average age was 54
– 57% were female
– 76% had stage 1 or stage 2 hypertension (blood pressure above 130/80 mm Hg)
– About 90% were overweight or had obesity
– Average HbA1c (a measure of blood sugar) was 5.8%, which is in the prediabetes range
– 36% were food-insecure
– One-third lacked health insurance
– 70% earned less than $50,000 per year
– Nearly 90% were foreign-born
Dr. Oborevwori noted that the high percentage of foreign-born participants is crucial for tailoring nutrition advice. Different cultural backgrounds come with different food traditions, and a one-size-fits-all approach may not work. For example, a person from West Africa may eat different staple foods than someone from Central America. Providing culturally appropriate food options could improve adherence to healthy eating.
What Experts Say About Food as Medicine
The idea of using food as medicine is gaining traction among doctors, researchers, and policymakers. At a 2024 Senate subcommittee hearing, Dr. Dariush Mozaffarian, director of the Food is Medicine Institute at Tufts University, stated that poor nutrition is the top cause of death and disability in the United States. He said it causes more harm than tobacco use, alcohol, physical inactivity, and air pollution combined.
Experts generally agree that simply telling people to eat better is not enough. Many patients face barriers like cost, lack of access, and limited time to prepare healthy meals. Programs like THRIVE aim to remove some of those barriers by providing free produce and one-on-one coaching. However, the THRIVE results suggest that motivation and readiness to change also play a big role.
The study found that participants with higher baseline DASH scores—meaning they already ate relatively well—benefited the most from the intervention. This suggests that food-as-medicine programs may work best for people who are already “primed” to make changes but need support to stick with it. For those who are not yet ready, simply providing food may not be enough.
Practical Takeaways for Readers
If you have high blood pressure or are at risk, here are some steps you can take based on this research:
– Focus on the DASH diet: Emphasize vegetables, fruits, whole grains, lean proteins, and low-fat dairy. Aim to limit sodium to less than 2,300 mg per day (about 1 teaspoon of salt).
– Know your numbers: Check your blood pressure regularly. A reading of 130/80 mm Hg or higher is considered hypertension.
– Assess your readiness: If you already eat a fairly healthy diet but struggle with consistency, a structured program—like a produce delivery service or nutrition coaching—might help you see results.
– Look for community resources: Many areas have food banks, farmers’ market vouchers, or produce prescription programs. Check with local health clinics or community centers.
– Consider cultural fit: If you are from a different cultural background, look for nutrition advice that respects your food traditions. A generic diet plan may not work well if it does not include foods you enjoy.
What Comes Next
Dr. Oborevwori emphasized that the THRIVE findings support the need for a larger, fully powered randomized controlled trial. Such a study would account for baseline readiness factors, such as how likely a person is to follow the DASH diet before the program starts. This could help researchers design more effective food-as-medicine programs that target the right people at the right time.
For now, the message is clear: Food can be a powerful tool for managing blood pressure, especially for those who are ready to make changes. But simply handing out produce may not be enough. Personalized coaching, cultural tailoring, and addressing social barriers like food insecurity and lack of insurance are all essential pieces of the puzzle.
As the food-as-medicine movement grows, the hope is that more people—especially those in underserved communities—will have access to the support they need to eat well and live healthier lives.
Source: MedPage Today
