For years, plant-based diets have been widely viewed as heart healthy. Fruits, vegetables, whole grains, and legumes are widely promoted as protective against cardiovascular disease. At first glance, the evidence seems reassuring. However, new large-scale research shows that not all plant-based diets are the same. When plant foods are heavily processed, the expected heart benefits can vanish, and in some cases, even reverse.
Importantly, a major French cohort study now shows that the level of processing matters just as much as whether food comes from plants or animals.
Looking Beyond “Plant vs Animal”
Until now, nutrition research often looked at plant and animal foods as opposing categories. Yet real life eating patterns are rarely that simple.
Previous studies had already linked high intake of ultra processed foods with increased cardiovascular risk. Separately, plant-based diets, when balanced and nutrient dense, have been associated with better heart outcomes.
What this new research did differently was connect these findings. Instead of simply classifying diets as plant based or animal based, researchers examined three factors at once,
• The proportion of plant vs animal foods
• The nutritional quality (fat, sugar, salt, vitamins, minerals)
• The degree of industrial processing
Together, this more realistic approach reflects how people actually eat in daily life.
Inside the Study
To explore this relationship in detail, researchers from INRAE, Inserm, Université Sorbonne Paris Nord, and Cnam analyzed data from 63,835 adults enrolled in the French NutriNet-Santé cohort.
Participants were followed for an average of 9.1 years, with dietary intake recorded using repeated, detailed online food questionnaires. This long follow up allowed for meaningful cardiovascular outcomes to emerge over time.
As a result, scientists were able to classify diets not just by food source, but also by nutritional value and processing level, using the widely accepted NOVA food classification system.
When Plant-Based Diets Protect the Heart
The results were both clear and encouraging, but only when plant foods were minimally processed.
Adults who consumed more nutrient rich, minimally processed plant foods, such as fresh fruits, vegetables, legumes, and whole foods low in added salt, sugar, and fat. had about a 40% lower risk of cardiovascular disease compared with those who ate fewer high quality plant foods and more animal-based products.
Taken together, this finding strongly reinforces existing public health advice, whole plant foods remain powerful allies for heart health.
When the Benefits Disappear
However, the advantage did not extend to diets high in ultra processed plant-based foods, even when those foods appeared nutritionally acceptable on the surface.
Specifically, people who relied heavily on items such as,
• Industrial whole meal breads
• Ready-made soups
• Packaged pasta dishes
• Commercial salads with dressings did not experience a reduction in cardiovascular risk compared with those eating more animal-based foods.
In other words, processing quietly cancels out the benefits of plant ingredients.
Ultra Processed Plant Foods (A 40% Higher Risk)
The most concerning results emerged in diets dominated by low quality, ultra processed plant foods. These included,
• Crisps and savory snacks
• Sugary breakfast cereals
• Sweetened fruit drinks and plant-based sodas
• Chocolate based confectionery and biscuits
Individuals consuming these foods had a roughly 40% higher risk of cardiovascular disease compared with those eating minimally processed, high quality plant foods.
Put simply, a diet can be technically “plant based” and still work against the heart.
Why Processing Changes Everything
To understand why this happens, it helps to look at what ultra-processing does to food.
Ultra processing often introduces additives, emulsifiers, refined sugars, hydrogenated fats, and altered food structures. These changes can have real biological effects, including,
• Promoting inflammation
• Disrupting lipid and glucose metabolism
• Reducing satiety, which encourages overconsumption
As a result, while the original ingredients may come from plants, the final product behaves very differently in the body.
What This Means for Everyday Eating
Taken together, these findings send a clear and practical message,
Plant based eating supports heart health only when it emphasizes whole, minimally processed foods.
Accordingly, public health recommendations are increasingly aligned with this idea, encouraging,
• Fresh or frozen fruits and vegetables
• Legumes and intact whole grains
• High quality canned foods without added salt, sugar, fats, or additives
Ultimately, the goal is not just “more plants,” but better plants.
The Takeaway
This landmark study reminds us that nutrition is not a binary choice between plant and animal foods. Quality and processing matter.
A plant-based diet built on whole foods can protect the heart, while one dominated by ultra processed products may quietly increase cardiovascular risk.
In nutrition, as in science, the details make all the difference.
FAQs
Q1. Does this study mean plant-based diets are bad for the heart?
No, the study shows that high quality, minimally processed plant-based diets are linked to a significantly lower risk of cardiovascular disease. The increased risk was mainly associated with ultra-processed plant foods.
Q2. What is ultra processed plant-based foods?
These are foods that undergo extensive industrial processing and often contain additives such as emulsifiers, sweeteners, refined oils, or flavor enhancers. Examples include sugary breakfast cereals, packaged snacks, sweetened plant drinks, and ready-to-eat meals.
Q3. Why does processing reduce the heart benefits of plant foods?
Ultra processing can alter food structure, increase added sugars, unhealthy fats, and sodium, and reduce beneficial nutrients and fiber. These changes can promote inflammation and metabolic disturbances linked to heart disease.
Q4. Are all packaged plant foods harmful?
No, some packaged foods, such as frozen vegetables or canned beans without added salt, sugar, or fats, are considered minimally processed and can still support heart health.
Q5. What is the key takeaway for people following plant-based diets?
Focus on whole, nutrient dense, and minimally processed plant foods rather than assuming all plant-based products are automatically healthy.
Disclaimer
This content is for educational purposes only and does not replace personalized medical or dietary advice. Individual nutritional needs and cardiovascular risk vary. Always consult a qualified healthcare professional before making major dietary changes.
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References
• The Lancet Regional Health, Europe (2025): Long-term cohort study linking plant food quality, processing level, and cardiovascular disease risk.
• The Lancet Regional Health, Europe (2024): UK Biobank analysis showing higher cardiovascular risk with ultra-processed plant foods.
• European Journal of Nutrition (2024), Review examining health and sustainability impacts of ultra-processed foods in plant-based diets