According to Gram Research analysis, about 25% of countries worldwide show high levels of both ischemic heart disease and asthma simultaneously, with these patterns concentrated in Africa, Asia, and Oceania. A 2026 global analysis of 204 countries identified 13 risk factors driving this comorbidity, with low omega-6 fat intake and iron deficiency increasing risk for both diseases. The study found that 43% of heart disease burden and 29% of asthma burden could be attributed to these modifiable risk factors, suggesting that nutritional improvements and environmental changes could prevent millions of cases.
A major global study analyzed how ischemic heart disease and asthma appear together across 204 countries and territories. Researchers found that about one-quarter of countries worldwide have high levels of both diseases at the same time, especially in Africa, Asia, and Oceania. The study identified 13 key risk factors that drive this pattern, with two factors—low omega-6 fat intake and iron deficiency—increasing risk for both conditions. The findings suggest that treating these diseases as connected health problems and targeting shared risk factors like nutrition and air quality could help millions of people worldwide.
Key Statistics
A 2026 global analysis of 204 countries found that approximately 25% of nations exhibit a ‘concordant pattern’ of high ischemic heart disease and asthma burden simultaneously, primarily located in Africa, Asia, and Oceania.
According to research reviewed by Gram, 43.083% of global ischemic heart disease cases and 28.963% of asthma cases are attributable to combined exposure to 13 identified modifiable risk factors including nutritional deficiencies and air pollution.
A 2026 spatial epidemiology study identified omega-6 polyunsaturated fatty acid deficiency and iron deficiency as common risk factors increasing susceptibility to both ischemic heart disease and asthma across 204 countries.
Research shows that household air pollution from solid fuels and kidney dysfunction are significant risk drivers for ischemic heart disease, while indoor air pollution particularly elevates asthma risk in resource-limited regions.
The Quick Take
- What they studied: Where ischemic heart disease and asthma occur together around the world, and what causes this pattern
- Who participated: Data from 204 countries and territories worldwide, analyzed through the Global Burden of Disease Study 2021
- Key finding: About 25% of countries show high levels of both diseases simultaneously, concentrated in Africa, Asia, and Oceania. Two shared risk factors—low omega-6 fat intake and iron deficiency—increase risk for both conditions.
- What it means for you: If you live in regions with limited resources, you may face higher risk of developing both conditions. Improving nutrition (especially omega-6 fats and iron) and reducing air pollution could help prevent or manage both diseases. Talk to your doctor about screening for both conditions if you have one.
The Research Details
Researchers analyzed data from the Global Burden of Disease Study 2021, which tracks health problems across the world. They looked at 204 countries and territories and used a method called disability-adjusted life years (DALYs)—basically a way to measure how much a disease affects people’s health and quality of life. They sorted countries into three groups based on their disease patterns: those with high levels of both diseases together (concordant), those with mainly heart disease (IHD-dominant), and those with mainly asthma (asthma-dominant).
To find what causes these patterns, the researchers used advanced computer analysis called machine learning. They tested hundreds of possible risk factors—things like diet quality, air pollution, kidney disease, and poverty levels—to see which ones actually mattered. They used a technique called random forest modeling to narrow down the list, then confirmed their findings with statistical tests.
Finally, they created a composite risk index, which is like a scorecard that adds up all the risk factors for each country. This helped them see which regions faced the biggest combined health challenges.
Most research looks at heart disease and asthma separately, but this study treats them as connected problems. This matters because people with both diseases face extra challenges, and they may share common causes. By understanding where these diseases cluster and what drives them, public health officials can design better prevention strategies that target multiple problems at once.
This study used data from a well-respected global health database (Global Burden of Disease Study 2021), which is regularly updated and widely used by health organizations. The researchers used multiple statistical methods to confirm their findings, which strengthens confidence in the results. However, the study is based on existing data rather than new experiments, so it shows patterns and associations rather than proving direct cause-and-effect relationships. The findings apply to countries as a whole, not necessarily to individual people.
What the Results Show
The study found that 204 countries and territories fall into three distinct patterns. About one-quarter show a “concordant pattern,” meaning they have high burdens of both ischemic heart disease and asthma at the same time. These countries cluster mainly in Africa, Asia, and Oceania—regions with fewer economic resources. Another group of countries shows mainly heart disease burden, while a third group shows mainly asthma burden.
The researchers identified 13 significant risk factors that drive these disease patterns. Two factors stood out as affecting both diseases: low intake of omega-6 polyunsaturated fatty acids (healthy fats found in foods like nuts, seeds, and vegetable oils) and iron deficiency (not having enough iron in your blood). Other risk factors affected mainly one disease—for example, kidney dysfunction raised heart disease risk, while household air pollution from burning solid fuels (like wood or coal for cooking) raised asthma risk.
When researchers added up the impact of all these risk factors, they found that 43% of the global burden of ischemic heart disease and 29% of asthma burden could be traced back to these modifiable risk factors. This means that nearly half of heart disease cases and almost one-third of asthma cases might be preventable by addressing these factors.
The composite risk index revealed that countries in Africa and Asia face the greatest cumulative risk exposure, meaning people in these regions deal with multiple risk factors at once, making them especially vulnerable to both diseases.
The study identified specific regional patterns. Countries in sub-Saharan Africa and South Asia showed particularly high concordant patterns, suggesting that the combination of poverty, limited healthcare access, poor nutrition, and environmental pollution creates conditions where both diseases flourish together. The research also showed that metabolic risk factors (like high blood pressure and high cholesterol) and behavioral factors (like smoking) played important roles in driving the disease burden.
Previous research has shown that heart disease and asthma are major global health problems, but most studies examined them separately. This research advances the field by showing they often occur together in predictable geographic patterns and share common risk factors. The finding that nutrition (omega-6 fats and iron) affects both diseases aligns with earlier research on these nutrients’ roles in heart and lung health. The emphasis on environmental factors like air pollution confirms what other studies have suggested about pollution’s impact on cardiopulmonary (heart and lung) health.
This study analyzes patterns at the country level, so it cannot explain why individual people develop both diseases. The data comes from existing sources rather than new experiments, so researchers can identify associations but cannot prove that one factor directly causes disease. Some countries may have better health data than others, which could affect accuracy. The study also cannot account for all possible risk factors—there may be other causes not included in the analysis. Finally, while the research identifies risk factors, it cannot determine whether addressing these factors would actually prevent disease in real-world settings.
The Bottom Line
High confidence: Improve dietary intake of omega-6 polyunsaturated fatty acids (eat more nuts, seeds, fish, and vegetable oils) and ensure adequate iron intake (through meat, beans, leafy greens, or supplements if needed). Moderate confidence: Reduce household air pollution by improving cooking conditions and ventilation, especially in regions using solid fuels. Moderate confidence: Screen for both heart disease and asthma if you live in high-burden regions or have other risk factors. Consult healthcare providers about personalized prevention strategies.
This research is most relevant for people living in Africa, Asia, and Oceania, especially in resource-limited areas. Public health officials and policymakers should use these findings to design integrated prevention programs. Healthcare providers should screen patients for both conditions, as they often co-occur. People with a family history of either disease should pay special attention to the identified risk factors. The findings also matter for global health organizations planning resource allocation.
Nutritional improvements may take 3-6 months to show measurable effects on inflammation markers. Environmental improvements (like reducing air pollution) may take longer to show health benefits—typically 6-12 months or more. Prevention benefits accumulate over years, so consistent attention to these factors is important for long-term health.
Frequently Asked Questions
What is the connection between heart disease and asthma?
Both diseases share common risk factors including low omega-6 fat intake, iron deficiency, and air pollution exposure. They often occur together in the same geographic regions, suggesting interconnected causes. Treating them as linked health problems rather than separate conditions may improve prevention and management strategies.
Which countries have the highest rates of both heart disease and asthma together?
Countries in Africa, Asia, and Oceania show the highest concurrent burden of both diseases, particularly in resource-limited regions. These areas face multiple challenges including poverty, limited healthcare access, poor nutrition, and environmental pollution that increase risk for both conditions.
Can improving my diet prevent both heart disease and asthma?
Increasing omega-6 polyunsaturated fatty acids (nuts, seeds, fish, vegetable oils) and ensuring adequate iron intake may reduce risk for both conditions. While diet alone cannot prevent disease, addressing these nutritional deficiencies is one of 13 modifiable risk factors identified as contributing to both diseases globally.
How does air pollution affect the risk of having both diseases?
Household air pollution from burning solid fuels for cooking significantly increases asthma risk and contributes to heart disease burden. Improving ventilation, using cleaner cooking methods, and reducing indoor air pollution exposure are important prevention strategies, especially in regions relying on traditional fuels.
Should I be screened for both conditions if I have one?
Yes, especially if you live in high-burden regions or have other risk factors. Since these diseases frequently co-occur and share common causes, screening for both conditions allows for earlier detection and integrated treatment approaches that address shared risk factors.
Want to Apply This Research?
- Track daily omega-6 fat intake (target: 1-2 servings of nuts, seeds, or fish daily) and iron-rich foods consumed. Monitor weekly symptom severity for both heart-related symptoms (chest discomfort, shortness of breath with exertion) and asthma symptoms (wheezing, coughing, breathing difficulty).
- Set a daily reminder to include one omega-6 rich food (handful of walnuts, tablespoon of flaxseed, or salmon serving). Log weekly air quality in your area and plan indoor activities on high-pollution days. Schedule quarterly check-ins with your healthcare provider to monitor both conditions.
- Create a monthly dashboard showing: (1) dietary compliance with omega-6 and iron targets, (2) symptom frequency and severity trends, (3) local air quality patterns, and (4) healthcare visit notes. Compare trends quarter-to-quarter to identify which lifestyle changes correlate with symptom improvement.
This research identifies global patterns and risk factors for ischemic heart disease and asthma comorbidity but does not provide personalized medical advice. Individual risk varies based on genetics, lifestyle, and local conditions. If you have symptoms of heart disease (chest pain, shortness of breath, fatigue) or asthma (wheezing, persistent cough, breathing difficulty), consult a healthcare provider for proper diagnosis and treatment. Dietary changes and environmental improvements may help reduce risk but should complement, not replace, medical care. Always discuss prevention and treatment strategies with your doctor before making significant changes.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.