According to Gram Research analysis, eating a healthy, anti-inflammatory diet reduces mortality risk by 32% in people with asthma-COPD overlap, a 2026 study of 609 U.S. adults found. People eating the highest-quality diets had significantly lower death rates, while those eating pro-inflammatory foods had 13% higher mortality risk. Key protective foods include whole fruits, dairy products, and healthy fats like those in fish and nuts.
A new study of over 600 Americans with a condition called asthma-COPD overlap (ACO)—where people have both asthma and COPD at the same time—found that eating a healthier diet could significantly reduce their risk of dying from any cause. Researchers looked at what people ate and measured both the overall quality of their diet and how much their food choices caused inflammation in their bodies. People who ate the healthiest, least inflammatory foods had the lowest risk of death, while those eating the most inflammatory foods had higher risk. The study suggests that simple dietary changes, like eating more whole fruits, dairy products, and healthy fats, could help people with ACO live longer and healthier lives.
Key Statistics
A 2026 study of 609 U.S. adults with asthma-COPD overlap found that combining a healthy diet with an anti-inflammatory diet reduced all-cause mortality risk by 32% compared to poor dietary patterns.
Research reviewed by Gram found that people eating the most pro-inflammatory diets had a 13% higher risk of death compared to those eating less inflammatory foods, in a 2026 analysis of 609 Americans with asthma-COPD overlap.
A 2026 study identified whole fruits, dairy products, polyunsaturated fats, and omega-6 fatty acids as the four most important dietary components for survival in 609 people with asthma-COPD overlap.
Kaplan-Meier survival analysis in a 2026 study of 609 U.S. adults showed significantly better long-term survival in people following low-risk dietary patterns (p < 0.0001).
The Quick Take
- What they studied: Whether eating a healthier diet and avoiding inflammatory foods could help people with asthma-COPD overlap (a condition where people have both asthma and COPD) live longer
- Who participated: 609 U.S. adults diagnosed with asthma-COPD overlap, using health data collected between 2007 and 2018
- Key finding: People who ate the healthiest, least inflammatory diets had a 32% lower risk of death compared to those eating the worst diets. The combination of eating healthy AND avoiding inflammatory foods was most protective.
- What it means for you: If you have asthma-COPD overlap, paying attention to what you eat—especially choosing whole fruits, dairy, and healthy fats—may help you live longer. However, this study shows association, not proof that diet causes longer life, so talk to your doctor about dietary changes.
The Research Details
Researchers used information from a large national health survey (NHANES) that tracked what Americans ate and their health outcomes from 2007 to 2018. They identified 609 people who had been diagnosed with asthma-COPD overlap based on medical records and breathing tests. For each person, they scored their diet in two ways: first, they measured overall diet quality using a system called the Healthy Eating Index, which rates how well someone follows nutrition guidelines. Second, they measured how inflammatory their diet was using the Dietary Inflammatory Index, which looks at whether foods tend to increase or decrease inflammation in the body.
The researchers then tracked which people died over the study period and used statistical methods to see if diet quality and inflammatory potential predicted who lived longer. They adjusted their analysis to account for other factors that affect lifespan, like age, smoking, exercise, and other health conditions. They also used advanced statistical techniques to look for non-linear relationships and identify which specific foods were most important for survival.
This research approach is important because asthma-COPD overlap is a serious condition with high death rates, and doctors have limited treatment options. Diet is something patients can control themselves, making it a practical target for improving health. By studying real-world data from a representative sample of Americans, the researchers could see how diet actually affects survival in people with this condition, rather than just studying diet in a lab.
This study has several strengths: it used a large, nationally representative sample of real Americans; it measured diet comprehensively using two different scoring systems; and it adjusted for many other factors that could affect the results. However, the study is observational, meaning it shows that healthier diets are linked to longer life, but doesn’t prove that diet directly causes longer life. The study also had moderate predictive accuracy (64-67%), meaning diet alone doesn’t perfectly predict who will live longer—other factors matter too. The findings need to be confirmed with intervention studies where people are randomly assigned to different diets.
What the Results Show
The study found clear evidence that diet quality matters for survival in people with asthma-COPD overlap. People in the highest quartile (top 25%) for diet quality had a 2% lower risk of death for each point increase on the diet quality scale. More dramatically, people eating the most pro-inflammatory diets had a 13% higher risk of death compared to those eating less inflammatory diets. The most powerful finding was that combining both a healthy diet AND an anti-inflammatory diet reduced mortality risk by 32% (meaning people had a 0.68 times the risk of death compared to those eating poorly).
The study identified four specific dietary components that were most important for survival: polyunsaturated fats (healthy fats found in fish, nuts, and seeds), total dairy products, whole fruits, and omega-6 fatty acids. These foods were incorporated into a predictive model that could somewhat predict who would have better survival outcomes. The researchers created survival curves showing that people eating low-risk diets had significantly better survival rates over time (p < 0.0001, meaning this difference was extremely unlikely to be due to chance).
The protective effects of healthy, anti-inflammatory diets were stronger in certain groups: people who drank alcohol moderately (not heavy drinkers or non-drinkers) and people without high blood pressure showed the biggest benefits from eating well. This suggests that diet may be especially important for people with fewer other health complications. The study also found that the relationship between diet and mortality wasn’t simply linear—meaning eating a little better helped, but eating much better helped even more.
This research builds on previous studies showing that diet influences inflammation and lung health, but it’s one of the first to specifically examine how diet affects survival in people with asthma-COPD overlap. Previous research has shown that the Healthy Eating Index and Dietary Inflammatory Index predict health outcomes in other populations, but this study extends those findings to this specific, high-risk group. The findings align with general nutrition science showing that anti-inflammatory diets protect against chronic disease.
The study has several important limitations. First, it’s observational, meaning researchers watched what people ate and what happened to them, but didn’t randomly assign people to different diets—so we can’t be certain diet caused the better outcomes. Second, diet was measured at only one point in time, but people’s eating habits change over years. Third, the study’s ability to predict who would survive was moderate (64-67% accuracy), meaning diet is important but other factors also matter significantly. Fourth, the study only included people in NHANES, which may not represent all Americans with asthma-COPD overlap. Finally, the study couldn’t prove that specific foods caused the benefits—only that people eating certain patterns had better outcomes.
The Bottom Line
If you have asthma-COPD overlap, consider working with a doctor or dietitian to increase whole fruits, dairy products, and healthy fats (like those from fish and nuts) in your diet, while reducing foods that promote inflammation. This evidence is moderately strong (based on a large, representative study) but not definitive proof. These dietary changes align with general healthy eating guidelines and are unlikely to cause harm.
This research is most relevant for people diagnosed with asthma-COPD overlap who want to improve their health outcomes. It may also interest people with asthma or COPD alone, though the study didn’t specifically examine those groups. People without lung disease should note that while these dietary patterns are generally healthy, the specific survival benefits shown here apply to people with ACO.
Dietary changes typically take weeks to months to show measurable effects on inflammation markers, and longer to affect overall health outcomes. You might notice improved breathing or energy within a few weeks of dietary changes, but significant survival benefits would likely take months to years to develop.
Frequently Asked Questions
Can changing my diet help me live longer if I have asthma and COPD together?
Research shows that eating a healthy, anti-inflammatory diet is associated with a 32% lower mortality risk in people with asthma-COPD overlap. While this suggests diet matters significantly, it’s not definitive proof that diet alone extends life—other factors also play important roles.
What specific foods should I eat if I have asthma-COPD overlap?
A 2026 study identified whole fruits, dairy products, polyunsaturated fats (fish, nuts, seeds), and omega-6 fatty acids as most protective. These foods reduce inflammation and support lung health. Avoid highly processed foods and those that increase inflammation.
How much does diet quality matter compared to other factors for people with asthma-COPD overlap?
Diet is important but not the only factor—the study’s predictive model had 64-67% accuracy, meaning diet explains a significant portion but not all of the variation in survival outcomes. Medication, exercise, smoking status, and other health conditions also matter substantially.
Is this study proof that I should change my diet if I have asthma-COPD overlap?
This study shows strong association between healthy diets and better survival, but it’s observational rather than a randomized trial, so it doesn’t prove causation. However, the dietary recommendations align with general healthy eating guidelines and are unlikely to cause harm.
How long does it take to see health benefits from eating a better diet with asthma-COPD overlap?
Inflammation markers may improve within weeks, and you might notice better breathing or energy within a few weeks. However, significant survival benefits would likely take months to years to develop, so consistency over time is important.
Want to Apply This Research?
- Track daily servings of whole fruits, dairy products, and sources of healthy fats (fish, nuts, seeds, olive oil) using the app’s food logging feature. Aim for at least 2 servings of whole fruit and 2-3 servings of dairy daily, with healthy fats at most meals.
- Set a weekly goal to try one new recipe featuring the key protective foods: whole fruits, dairy, or healthy fats. Use the app’s recipe suggestions filtered for anti-inflammatory ingredients, and log meals to monitor your progress toward a higher Healthy Eating Index score.
- Use the app to calculate a weekly Healthy Eating Index score based on your logged meals. Track trends over 4-week periods, noting any improvements in symptoms like breathing difficulty or energy levels. Share monthly reports with your healthcare provider to discuss how dietary changes are affecting your health.
This research shows associations between diet and survival in people with asthma-COPD overlap, but does not prove that dietary changes will extend your life. Individual results vary based on genetics, medications, disease severity, and other factors. Before making significant dietary changes, especially if you take medications or have other health conditions, consult with your doctor or a registered dietitian. This article is for educational purposes and should not replace professional medical advice. If you have asthma-COPD overlap, work with your healthcare team to develop a personalized nutrition plan appropriate for your specific situation.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.