Research shows that older adults who eat the most inflammatory foods have a 26% higher risk of dying compared to those eating the least inflammatory foods, according to a Gram Research analysis of 6,300 Americans followed for nearly 10 years. Each 1-point increase in a diet’s inflammation score raised death risk by 5.6%, with about 10% of this increased risk working through kidney damage. Choosing anti-inflammatory foods like fruits, vegetables, and fish may help extend lifespan in older age.
A major study of over 6,300 older Americans found that eating more inflammatory foods—those that trigger body-wide inflammation—increases the risk of dying from any cause. Researchers tracked participants for nearly 10 years and discovered that people with the most inflammatory diets had a 26% higher death risk than those eating the least inflammatory foods. Interestingly, part of this increased risk appears to work through kidney function. According to Gram Research analysis, the findings suggest that making dietary changes to reduce inflammation could be an important way for older adults to live longer and healthier lives.
Key Statistics
A 2026 cohort study of 6,300 older Americans found that those eating the most inflammatory diets had a 26% higher all-cause mortality risk compared to those eating the least inflammatory diets over a 9.7-year follow-up period.
According to research reviewed by Gram, each 1-unit increase in the Dietary Inflammatory Index raised all-cause mortality risk by 5.6% in adults over 60, with an adjusted hazard ratio of 1.056 (95% CI: 1.020-1.094).
A retrospective analysis of 6,300 older adults from 2001-2018 NHANES data found that kidney function (eGFR) mediated approximately 9.67% of the association between inflammatory diet and all-cause mortality.
Over 116.4 months of follow-up in a study of 6,300 older Americans, 1,746 deaths occurred, with dietary inflammation patterns significantly predicting mortality risk independent of age, smoking, and physical activity.
The Quick Take
- What they studied: Whether eating foods that cause inflammation in the body increases the risk of death in people over 60, and whether kidney function plays a role in this connection.
- Who participated: 6,300 adults aged 60 and older from across the United States who participated in national health surveys between 2001 and 2018. Researchers followed these people for an average of nearly 10 years.
- Key finding: People who ate the most inflammatory foods had a 26% higher risk of dying from any cause compared to those who ate the least inflammatory foods. For every 1-point increase in a diet’s inflammation score, death risk went up by 5.6%.
- What it means for you: Choosing less inflammatory foods—like fruits, vegetables, whole grains, and fish instead of processed foods and sugary items—may help older adults live longer. However, this study shows correlation, not that diet directly causes longer life, so talk to your doctor about dietary changes.
The Research Details
This was a retrospective cohort study, which means researchers looked back at health information that was already collected. They used data from the National Health and Nutrition Examination Survey, a large government program that tracks the health of Americans over many years. Researchers measured each person’s diet using a special scoring system called the Dietary Inflammatory Index (DII), which rates foods based on whether they increase or decrease inflammation in the body. They then followed these people over time to see who died and from what causes, using death records from the National Center for Health Statistics.
The researchers used statistical methods called Cox proportional hazards models to figure out whether people with higher inflammation scores in their diets were more likely to die. They also performed mediation analysis, which is a technique that helps identify whether one factor (like kidney function) explains part of the connection between two other things (like diet and death risk).
This approach is strong because it uses real-world data from thousands of people followed over many years, rather than relying on short-term experiments or small groups.
Understanding how diet affects lifespan in older adults is crucial because this age group faces the highest risk of death from various causes. By identifying specific dietary patterns that increase risk, researchers can recommend practical changes that might help people live longer. The study also explores the mechanism—how kidney function might be involved—which helps explain why inflammatory diets are harmful and suggests that monitoring kidney health might be important.
This study has several strengths: it included a large, diverse sample of 6,300 people; it followed them for nearly 10 years; it used standardized dietary assessment methods; and it adjusted for many other factors that might affect mortality (like age, smoking, and exercise). However, the study is observational, meaning it shows associations but cannot prove that diet directly causes differences in lifespan. People who eat inflammatory foods might differ in other ways that affect health. Additionally, dietary information was collected at one point in time, so it doesn’t capture how eating habits changed over the years.
What the Results Show
Over the study period of 116.4 months (about 9.7 years), 1,746 of the 6,300 participants died. The researchers found a clear relationship between diet inflammation and death risk: for every 1-point increase on the Dietary Inflammatory Index, the risk of dying increased by 5.6%. When they divided participants into three groups based on their DII scores (lowest, middle, and highest inflammation), the results were striking: people in the highest inflammation group had a 26% higher risk of dying compared to those in the lowest group.
The study participants had an average DII score of 0.73 and an average age of about 69 years. The relationship between inflammatory diet and death risk remained significant even after researchers adjusted for other important factors like age, sex, race, smoking status, physical activity, and body weight. This suggests that the diet-death connection is independent of these other risk factors.
When researchers examined kidney function (measured by eGFR, or estimated glomerular filtration rate), they found that it partially explained the connection between inflammatory diet and death. Specifically, kidney function accounted for about 9.67% of the increased death risk associated with inflammatory diets. This means that eating inflammatory foods may harm the kidneys, and damaged kidneys may then increase death risk.
The study found that the relationship between inflammatory diet and mortality was consistent across different age groups and demographic categories, suggesting the findings apply broadly to older adults. The fact that kidney function mediated only about 10% of the association suggests that other mechanisms—such as inflammation’s direct effects on the heart, blood vessels, and immune system—likely explain most of the increased death risk.
Previous research has shown that inflammatory diets are linked to chronic diseases like heart disease, diabetes, and cancer. This study extends that knowledge by demonstrating a direct connection to overall mortality in older adults specifically. The finding that kidney function plays a partial role is relatively novel and suggests a specific pathway through which inflammatory foods may harm health. The magnitude of the effect (26% higher mortality in the highest vs. lowest inflammation group) is consistent with other major dietary risk factors studied in older populations.
This study cannot prove that inflammatory diets cause earlier death—only that they are associated with it. People who eat inflammatory foods might differ in unmeasured ways (like stress levels or access to healthcare) that also affect lifespan. The dietary information was collected at one point in time, so the study doesn’t know if people’s eating habits changed during the follow-up period. Additionally, the study relied on self-reported dietary information, which can be inaccurate. The study also cannot determine whether the relationship between diet and mortality is the same for all ethnic groups or socioeconomic levels, though the researchers tried to account for these factors statistically.
The Bottom Line
Based on this research, older adults should consider reducing their intake of inflammatory foods (processed foods, sugary drinks, refined grains, and fried foods) and increasing anti-inflammatory foods (fruits, vegetables, whole grains, fish, nuts, and olive oil). Regular monitoring of kidney function through blood tests may also be important. These recommendations have moderate confidence because the study shows strong associations but cannot prove causation. Discuss dietary changes with your doctor, especially if you have kidney disease or other chronic conditions.
This research is most relevant to adults over 60, particularly those with risk factors for kidney disease or cardiovascular disease. It’s also important for healthcare providers who counsel older patients on nutrition. People of all ages should note that inflammatory diets appear harmful, but this study specifically examined older adults. Younger people should not assume the same risks apply to them without additional research.
The benefits of dietary changes typically appear gradually. Inflammation markers in the blood may improve within weeks to months of dietary changes, but the impact on lifespan would take years to observe. Most people notice improvements in energy, digestion, and how they feel within 4-8 weeks of reducing inflammatory foods. However, the major benefit—living longer—would only be measurable over years or decades.
Frequently Asked Questions
What foods are considered inflammatory and should older adults avoid?
Inflammatory foods include processed meats, sugary drinks and desserts, refined grains (white bread, pastries), fried foods, and foods high in unhealthy fats. Research shows older adults eating these foods had 26% higher mortality risk. Focus instead on vegetables, fruits, whole grains, fish, nuts, and olive oil.
How does diet affect kidney function in older adults?
Inflammatory foods may damage kidney cells over time, reducing kidney function (measured by eGFR). This study found that about 10% of the increased death risk from inflammatory diets works through kidney damage. Healthy kidneys are crucial for filtering waste and regulating blood pressure, so protecting them through diet matters.
Can changing my diet now reduce my mortality risk if I’m over 60?
This study shows association, not proof of causation, so individual results vary. However, switching to anti-inflammatory foods may improve kidney function, reduce inflammation markers, and potentially extend lifespan. Benefits like better energy and digestion appear within weeks; longevity benefits would take years to measure.
How is the Dietary Inflammatory Index calculated and should I track it?
The DII scores foods based on whether they increase or decrease body inflammation. Foods like berries and leafy greens lower the score; processed foods and sugar raise it. You don’t need to calculate it precisely—simply eat more whole foods and fewer processed foods to reduce inflammation and lower your mortality risk.
Should I get my kidney function tested if I eat an inflammatory diet?
Yes, especially if you’re over 60. A simple blood test measuring eGFR (estimated glomerular filtration rate) shows kidney health. This study found inflammatory diets may damage kidneys, so regular monitoring helps catch problems early. Ask your doctor about annual kidney function screening.
Want to Apply This Research?
- Track your Dietary Inflammatory Index score weekly by logging the specific foods you eat. Focus on counting servings of anti-inflammatory foods (leafy greens, berries, fatty fish, nuts) versus pro-inflammatory foods (processed meats, sugary drinks, refined grains). Set a goal to increase anti-inflammatory foods by 2-3 servings per week.
- Use the app to create a simple meal plan that swaps inflammatory foods for anti-inflammatory alternatives. For example, replace sugary breakfast cereals with oatmeal and berries, or swap fried chicken for grilled salmon. Start with one meal per day and gradually expand to other meals.
- Set monthly reminders to review your dietary patterns and kidney health markers if available. Track how you feel (energy levels, digestion, joint pain) alongside your dietary choices. If you have access to blood work results, monitor kidney function (eGFR) annually and share results with your healthcare provider to assess whether dietary changes are benefiting your kidney health.
This research shows an association between inflammatory diets and mortality in older adults but does not prove that diet directly causes differences in lifespan. Individual results vary based on genetics, overall health status, and other lifestyle factors. Before making significant dietary changes, especially if you have kidney disease, diabetes, heart disease, or take medications, consult with your healthcare provider or registered dietitian. This article is for educational purposes and should not replace professional medical advice. If you experience symptoms like fatigue, swelling, or changes in urination, seek immediate medical attention.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.