Ultra-Processed Foods: What Five Years of Research Is Telling Us

The evidence linking ultra-processed food consumption to poor health outcomes has grown substantially in recent years, and it has reached a point where the clinical nutrition community is treating it as one of the defining dietary issues of our time. The NOVA classification system, developed by Brazilian researcher Carlos Monteiro and colleagues, categorizes foods by the degree of industrial processing they have undergone rather than by their nutrient content. Ultra-processed foods — packaged snacks, sweetened beverages, reconstituted meat products, instant noodles and fast food — are formulated from industrial ingredients with little or no whole food remaining.

Large epidemiological studies published in the BMJ, JAMA Internal Medicine and Cell Metabolism have found consistent associations between higher ultra-processed food intake and increased risk of cardiovascular disease, type 2 diabetes, cancer, depression and all-cause mortality. A notable 2019 NIH randomized controlled trial by Hall and colleagues — the first to test ultra-processed food consumption in a controlled setting — found that participants randomized to an ultra-processed diet consumed 500 more calories per day and gained weight compared to those eating an unprocessed diet of matched macronutrients and palatability, suggesting that something beyond the nutrient profile drives overconsumption.

This research does not mean every processed food is harmful — it means being thoughtful about the proportion of your diet that comes from industrially reformulated products versus whole or minimally processed foods. Practical strategies include cooking more meals at home, reading ingredient lists and choosing foods with recognizable ingredients. Working with a dietitian can help you identify where ultra-processed foods have crept into your diet and find satisfying whole-food alternatives.

Sources

• Monteiro CA, et al. Ultra-processed foods: what they are and how to identify them. Public Health Nutr. 2019;22(5):936-941.

• Hall KD, et al. Ultra-processed diets cause excess calorie intake and weight gain: an inpatient randomized controlled trial. Cell Metab. 2019;30(1):67-77.

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