Prevalence, regional variation, and temporal trends in Dietary Approaches to Stop Hypertension (DASH) diet adherence in Africa: a weighted analysis of WHO STEPS surveys, 2003–2023
This study analyzed WHO STEPS survey data from 39 African countries between 2003 and 2023 to reveal that nearly half of adults exhibit low adherence to the DASH diet, with significant regional disparities and specific demographic risk factors, thereby highlighting the need for targeted nutrition interventions to combat diet-related non-communicable diseases across the continent.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Across the African continent, the landscape of health is shifting. For decades, infectious diseases have dominated the conversation, but a quieter, slower-moving challenge is rising: heart disease and high blood pressure. These conditions are increasingly linked to what people eat. One of the most well-known strategies for protecting the heart is a way of eating called the DASH diet. This approach encourages people to fill their plates with fruits and vegetables, choose whole grains and low-fat dairy, and strictly limit how much salt they add to their food. It is a simple, powerful idea that has been proven to lower blood pressure in clinical trials. However, while doctors and health officials know this diet works, there has been a significant gap in understanding how well ordinary people across Africa are actually following it. The continent is vast and diverse, with some regions still relying heavily on traditional, plant-based farming diets, while others are rapidly adopting processed foods due to urbanization. Without clear data, it is impossible to know if these changes are helping or hurting heart health on a population level.
To fill this gap, researchers from the University of Zambia gathered a massive amount of information from thirty-nine different African countries, spanning two decades from 2003 to 2023. They used data from the World Health Organization's STEPS surveys, which are standard health checks conducted in communities to measure risk factors for non-communicable diseases. Instead of trying to measure every single food a person ate, the researchers focused on three specific, easy-to-track habits that form the core of the DASH diet: how many days a week a person eats fruit, how many days they eat vegetables, and how often they add extra salt to their meals. By combining these three habits into a single score, they could categorize adults into groups with low, moderate, or high adherence to this heart-healthy pattern. They then analyzed the data from over 200,000 adults, weighting the results to ensure they accurately reflected the populations of these nations, to see who was eating well and who was not.
The results reveal a complex picture where nearly half of the adults surveyed across these countries are not following a heart-healthy diet. Specifically, 47.4 percent of the population showed low adherence to the DASH pattern. This means that almost one in two adults is not eating enough fruits and vegetables or is consuming too much salt to protect their blood pressure. However, this average hides a story of extreme variation. The situation is not the same everywhere. In Eastern Africa, the rate of low adherence was the lowest, at 43 percent, while in Middle Africa, it was the highest, reaching nearly 79 percent. When looking at individual countries, the difference is even starker. In Ethiopia, only 17.1 percent of people had low adherence, suggesting a population that largely follows a heart-healthy diet. In contrast, in the Central African Republic, a staggering 96.1 percent of people had low adherence, indicating that the vast majority of the population is missing out on these protective dietary habits.
One of the most surprising findings challenges a common assumption about education and health. Usually, higher levels of education are linked to healthier behaviors, as people with more schooling tend to have better access to information and resources. In this study, however, the opposite was true for diet. Adults with secondary or tertiary education were significantly more likely to have low adherence to the DASH diet compared to those with no formal education. The researchers also found that living in a city was a strong predictor of poor dietary habits. Urban residents were more likely to have low adherence than those living in rural areas. This suggests that as African cities grow and people move away from traditional farming lifestyles, they are increasingly turning to processed foods and adding more salt to their meals, a shift that is happening faster than the adoption of heart-healthy eating patterns.
The study also looked at how these habits have changed over time. The data showed a modest, though not statistically certain, decline in low adherence over the last twenty years, suggesting that the situation is not getting worse and might be improving slightly in some areas. However, this trend is not uniform across the continent. While some regions showed a slow improvement, others remained flat. The researchers noted that the years between 2015 and 2019 saw a dip in low adherence, but the most recent data from 2020 to 2023 did not show a continued improvement, possibly due to the disruptions caused by the global pandemic. Despite these fluctuations, the overall trajectory does not show a clear worsening, which offers a glimmer of hope.
Ultimately, this research highlights that the fight against high blood pressure in Africa cannot be fought with a single strategy. The needs of a person in the Central African Republic are vastly different from those of a person in Ethiopia. The findings point to specific groups that need immediate attention: people living in cities and those with higher levels of education, who are currently the least likely to follow a heart-healthy diet. By understanding exactly where the gaps are and who is most at risk, health officials can design targeted programs to encourage better eating habits. The goal is to ensure that as the continent develops, its people do not lose the protective benefits of their traditional diets but instead find a way to integrate healthy, heart-protective foods into their modern lives.
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