Research shows that following the EAT-Lancet diet, a plant-focused eating plan, is connected to lower risks of heart disease and early death through changes in blood chemistry. A Gram Research analysis of 3,370 American adults tracked for up to 29 years found that four specific metabolites, or blood chemicals, explain part of this protection. Glycerate, a metabolite that increases with plant-based eating, was associated with an 11 percent lower risk of heart disease and a 14 percent lower risk of death from any cause.
A major study following thousands of Americans for nearly 30 years found that eating according to the EAT-Lancet diet, a plant-focused eating plan designed to be healthy for both people and the planet, is connected to lower risks of heart disease and living longer. Researchers discovered that this connection works through specific chemicals in the blood called metabolites. By studying these metabolites, scientists identified four key blood markers that appear to explain why this diet protects heart health. According to Gram Research analysis, this discovery helps explain the biological mechanisms behind why eating more plants and less meat benefits our cardiovascular system and overall lifespan.
Key Statistics
A 29-year cohort study of 3,370 American adults found that people following the EAT-Lancet diet more closely had 11 percent lower risk of heart disease and 14 percent lower risk of death from any cause, with glycerate as a key protective blood metabolite.
According to research reviewed by Gram, 29 out of 359 measured blood metabolites were associated with the EAT-Lancet diet, with four showing significant connections to cardiovascular disease or mortality risk in a study spanning 1987 to 2022.
A long-term study of 3,370 adults found that indolepropionate, a metabolite produced by gut bacteria when consuming plant fiber, was linked to a 14 percent lower risk of death from any cause over 29 years of follow-up.
Research shows that O-methylcatechol sulfate, a metabolite associated with processed food consumption, was positively linked to both heart disease and mortality risk, suggesting that avoiding processed foods may protect heart health.
The Quick Take
- What they studied: Whether eating a plant-focused diet recommended by health experts is connected to heart disease and living longer, and what happens in the body to create this protection.
- Who participated: 3,370 American adults from a long-running health study that began in 1987. Researchers tracked their eating habits and blood chemistry for up to 29 years.
- Key finding: People who followed the EAT-Lancet diet more closely had lower risks of heart disease and early death. Four specific blood chemicals explained part of this protection, with one chemical called glycerate showing the strongest protective effect.
- What it means for you: Eating more plants, whole grains, and nuts while reducing meat and processed foods may protect your heart and help you live longer. However, this study shows association, not that the diet directly causes these benefits, and individual results vary based on genetics and other lifestyle factors.
The Research Details
This study used data from a long-term health research project called the Atherosclerosis Risk in Communities study, which has been tracking American adults since 1987. The researchers split participants into two independent groups to verify their findings. They measured how closely each person followed the EAT-Lancet diet using a detailed food questionnaire asking about 66 different foods. Then they analyzed blood samples to identify 359 different metabolites, which are chemical substances created when your body processes food. Using statistical methods, they found which metabolites were connected to following the diet more closely, and then tracked whether people with higher levels of these metabolites had fewer heart problems or deaths over the next 24 to 29 years.
The EAT-Lancet diet emphasizes plant-based foods like vegetables, fruits, whole grains, legumes, and nuts, while limiting red meat, processed foods, and added sugars. This approach was designed by international health experts to be good for both human health and environmental sustainability. The researchers used a scoring system called the Planetary Health Diet Index to measure how well each person followed these recommendations.
The study was particularly rigorous because it used two separate groups of people to confirm findings, followed participants for decades, and used statistical methods to account for other factors that might affect heart health, such as age, smoking, and exercise habits.
Understanding the biological mechanisms behind why certain diets protect heart health helps doctors and nutritionists give better advice. Rather than just saying ’eat more plants,’ this research identifies specific blood markers that change when you eat this way, which could eventually lead to personalized nutrition recommendations and better ways to predict who will benefit most from dietary changes.
This study has several strengths: it followed people for nearly 30 years, used two independent groups to confirm findings, measured actual blood chemistry rather than relying only on self-reported health, and accounted for many other health factors. However, the study only shows that the diet and these blood markers are connected, not that the diet directly causes the health benefits. The participants were American adults, so findings may not apply equally to other populations. The study also relied on food questionnaires, which depend on people accurately remembering what they ate.
What the Results Show
Out of 359 metabolites measured in blood samples, 29 were significantly connected to following the EAT-Lancet diet more closely. Of these 29 metabolites, four showed strong connections to heart disease or death rates. Glycerate, a metabolite produced when your body breaks down certain foods, was the most protective: people with higher glycerate levels had an 11 percent lower risk of heart disease and a 14 percent lower risk of dying from any cause during the study period.
Indolepropionate, a metabolite produced by gut bacteria when you eat plant fiber, was linked to a 14 percent lower risk of death from any cause. A metabolite called 1-docosahexaenoylglycerophosphocholine, which is related to omega-3 fatty acids found in fish and plant sources, was associated with a 12 percent lower risk of heart disease. These protective metabolites increased when people ate more plants, whole grains, and other foods emphasized in the EAT-Lancet diet.
One metabolite called O-methylcatechol sulfate showed the opposite pattern: higher levels were connected to increased risk of both heart disease and death. This metabolite may increase when people eat more processed foods and less plant-based foods. The findings suggest that the EAT-Lancet diet protects heart health partly by changing the mix of chemicals in your blood in beneficial ways.
The study found that 23 metabolites increased with better adherence to the EAT-Lancet diet, while 6 metabolites decreased. This suggests the diet creates widespread changes in blood chemistry. The protective metabolites were particularly connected to eating more fiber-rich plant foods, which feed beneficial gut bacteria that produce protective compounds. The study also confirmed that people who followed the diet more closely had better long-term health outcomes, consistent with previous research on plant-based eating patterns.
Previous research has shown that plant-based diets reduce heart disease risk, but this study goes deeper by identifying specific blood chemicals that explain why. Other studies have linked similar metabolites to heart health, but this is one of the first to connect them specifically to the EAT-Lancet diet in a large, long-term study. The findings align with research showing that gut bacteria and their products play important roles in heart health.
The study shows association between the diet and health outcomes, but cannot prove the diet directly causes the benefits, since people who eat healthier often exercise more and have other healthy habits. The food questionnaire asked about eating patterns from 1987-1989, and people’s diets may have changed over the 29-year follow-up period. The study participants were mostly American adults, so results may differ for other populations. The study measured metabolites only once at the beginning, so it could not track how metabolite levels changed over time. Additionally, the study could not identify all possible mechanisms, as 25 of the 29 diet-related metabolites were not connected to the measured health outcomes.
The Bottom Line
Eating more plant-based foods, whole grains, legumes, nuts, and vegetables while reducing red meat and processed foods appears to protect heart health and may help you live longer. This recommendation is supported by strong evidence from this long-term study and many others. Start by adding more plant foods to meals you already enjoy rather than making drastic changes. Even partial adoption of these eating patterns shows benefits. Consult with a doctor or registered dietitian before making major dietary changes, especially if you have existing health conditions or take medications.
Anyone concerned about heart disease, which remains a leading cause of death, should consider these findings. People with family history of heart disease, high blood pressure, high cholesterol, or diabetes may benefit most. The recommendations apply to adults of all ages, though older adults should ensure adequate protein and nutrient intake when increasing plant foods. People with certain medical conditions or dietary restrictions should work with a healthcare provider to adapt these principles to their situation.
Blood chemistry changes may occur within weeks of dietary changes, but measurable improvements in heart health typically take months to years. Long-term adherence is more important than short-term perfection. The protective effects observed in this study developed over decades of eating patterns, suggesting that consistency matters more than intensity.
Frequently Asked Questions
What is the EAT-Lancet diet and how does it help your heart?
The EAT-Lancet diet emphasizes plant-based foods like vegetables, fruits, whole grains, legumes, and nuts while limiting red meat and processed foods. A 29-year study found it reduces heart disease risk by 11 percent and early death risk by 14 percent through changes in blood chemistry.
How long does it take to see health benefits from eating a plant-based diet?
Blood chemistry changes may occur within weeks, but measurable improvements in heart health typically take months to years. The protective effects in this study developed over decades, suggesting consistency matters more than quick results.
Can I still eat meat if I follow the EAT-Lancet diet?
Yes, the EAT-Lancet diet limits rather than eliminates meat. It recommends small amounts of poultry and fish while reducing red meat consumption. The focus is on making plant foods the foundation of most meals.
What are metabolites and why do they matter for heart health?
Metabolites are chemical substances your body creates when digesting food. This study identified four metabolites that increase with plant-based eating and are connected to lower heart disease and death risks, explaining how diet protects your heart at the biological level.
Does this study prove that the EAT-Lancet diet prevents heart disease?
The study shows strong association between the diet and lower heart disease risk, but cannot prove the diet directly causes this protection. People eating healthier often exercise more and have other healthy habits that also protect heart health.
Want to Apply This Research?
- Track daily servings of plant-based foods (vegetables, fruits, whole grains, legumes, nuts) and weekly servings of red meat. Aim to increase plant servings and decrease red meat consumption by 10-20 percent each month until reaching EAT-Lancet recommendations.
- Use the app to log meals and receive real-time feedback on how closely your eating pattern matches the EAT-Lancet diet. Set reminders to include a plant-based protein source at each meal, such as beans, lentils, tofu, or nuts. Create a weekly meal plan emphasizing plant foods and track completion.
- Monitor changes in energy levels, digestion, and how you feel over 4 to 8 weeks. If possible, work with a healthcare provider to track blood pressure, cholesterol, and other heart health markers annually. Use the app to identify patterns in which plant-based foods you enjoy most, making the diet easier to sustain long-term.
This research shows associations between diet and health outcomes but does not prove that dietary changes will prevent heart disease or extend lifespan in any individual. Results from studies of large populations may not apply equally to all people due to differences in genetics, age, existing health conditions, and other lifestyle factors. Before making significant dietary changes, especially if you have heart disease, high blood pressure, diabetes, or take medications, consult with your doctor or a registered dietitian. This article is for educational purposes and should not replace professional medical advice.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.