Ultra-processed foods have become one of the biggest topics in nutrition. Many people now check food labels mainly to see how processed a product is.
A new study suggests there may be a better question to ask: How nutritious is the food?
Scientists from the Harvard T.H. Chan School of Public Health analysed data collected from more than 200,000 American adults over several decades. Their goal was to discover whether food processing or overall diet quality had the greater influence on health.
The researchers focused on plant-based eating patterns rather than comparing vegetarians with meat eaters.
They examined foods ranging from fresh vegetables and homemade meals to packaged cereals, canned beans, plant-based dairy products, soft drinks, and refined snack foods.
Participants were grouped according to whether they followed healthy or unhealthy plant-based diets and whether those diets contained mostly minimally processed or ultra-processed foods. This allowed the scientists to compare similar diets with different processing levels.
The results were clear. People who regularly ate nutrient-dense foods had lower rates of heart disease, type 2 diabetes, and death. People whose diets contained fewer nutritious foods had poorer health outcomes.
Surprisingly, processing level alone had little influence once overall diet quality was considered. Healthy eating patterns that included some processed foods performed almost as well as healthy diets made mostly from minimally processed foods.
The study also showed that not every ultra-processed food should automatically be viewed as unhealthy. Some provide valuable nutrients through whole grains, added vitamins, minerals, fibre, or plant proteins. At the same time, foods made at home from refined flour, sugar, or other low-quality ingredients are not necessarily healthy simply because they are minimally processed.
These findings suggest that nutrition advice should continue to encourage eating a wide variety of high-quality foods instead of focusing on one single feature such as processing. Mediterranean-style diets and healthy plant-based diets remain among the best-supported eating patterns for preventing chronic disease.
The researchers also believe food companies can play a role by improving the nutritional value of packaged products. Healthier processed foods could make good nutrition more practical and affordable for many people.
This study adds an important perspective to the ongoing debate about ultra-processed foods. Its greatest strengths are its very large sample size and long follow-up period.
However, because it was observational and presented at a scientific conference, additional peer-reviewed research is needed before firm conclusions can be drawn.
Overall, the evidence suggests that the quality of the foods on your plate matters far more than whether every item is minimally processed.
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For more health information, please see recent studies about the connection between potatoes and high blood pressure, and results showing why turmeric is a health game-changer.
Source: Harvard T.H. Chan School of Public Health.
