Recently, an attempt was made to coin a new term detailing the modern world’s impact on the body. The idea was to describe an environment that significantly speeds up aging, or senescence, influenced by factors such as obesity, stress, extreme heat, and pollution. This proposed term was “senesogenic environment.” While the concept drew inspiration from the established “obesogenic environment” which promotes obesity, the coinage did not gain traction.
However, an important element contributing to premature aging was overlooked in that initial effort: ultra-processed foods (UPFs). This oversight presents an opportunity to revisit the concept and its contributing factors. UPFs represent a distinct category of food products that undergo extensive processing.
Understanding Ultra-Processed Foods
The precise definition of UPFs is a subject of ongoing discussion. Generally, they are factory-made, pre-packaged items. Their creation involves purified ingredients like sugars, fats, and proteins, which are often chemically altered. These foods frequently contain synthetic additives such as dyes, emulsifiers, and preservatives. A common characteristic of UPFs is their low nutritional value, lacking essential nutrients like fiber and vitamins. Conversely, they are typically high in fat, salt, and sugar. Examples include many ready-to-eat microwave meals, salty snacks, mass-produced breads, sugary beverages, instant noodles, ice cream, candies, baked goods, processed meats, and condiments like mayonnaise and ketchup.
The Rise of UPFs in Modern Diets
Over the last half-century, UPFs have increasingly become a staple in Western diets. In high-income nations, such as the United Kingdom, over half of all consumed calories now come from UPFs. While this trend has stabilized in the past decade in some regions, the global demand for UPFs continues to rise. The widespread availability, convenience, affordability, and appealing taste of these foods contribute to their popularity.
Health Implications of High UPF Consumption
Avoiding UPFs is widely acknowledged as beneficial for health, a conclusion supported by extensive research. High consumption of UPFs has been linked to a range of chronic health issues. These include obesity, various forms of cancer, type 2 diabetes, cardiovascular diseases, inflammatory bowel disease, fatty liver disease, and kidney disease.
Furthermore, a high intake of UPFs is associated with an increased risk of mortality from all causes. Three independent studies conducted in Spain, France, and the United States, each involving tens of thousands of participants, found that individuals with the highest UPF consumption had a significantly greater likelihood of dying during the study periods compared to those with more moderate intake.
Investigating the Mechanisms of UPF Harm
The specific mechanisms through which such a diverse group of foods can lead to a wide array of health conditions remain an area of investigation. One obvious explanation is that UPFs contribute to obesity, which in turn can lead to many other health problems. Other potential factors include poor nutritional quality, the presence of additives, toxic substances generated during processing, and chemicals that may leach from plastic packaging. Some researchers also propose that the processing itself introduces additional detrimental effects, but definitive conclusions are yet to be reached.
UPFs and Accelerated Biological Aging
Recent studies provide significant insights, suggesting that UPFs actively contribute to premature aging. In 2024, a research analysis examined the diets of 16,055 U.S. adults aged 20 to 79, using data collected between 2003 and 2010 from the National Health and Nutrition Examination Survey (NHANES). The researchers estimated the percentage of calories each participant consumed from UPFs and also assessed their biological ages. They found a correlation: a higher UPF intake was associated with a greater difference between a person’s chronological age and their biological age.
Specifically, each 10 percent increase in calorie intake from UPFs added, on average, 0.21 years, or approximately two and a half months, to this age divergence. The disparity in biological age between the lowest consumers (less than 39 percent of calories from UPFs) and the highest consumers (more than 68 percent) was 0.86 years.
While biological age measurements can be imprecise, these findings are considered valid for comparative research where participants are assessed against each other. Any systematic measurement errors would apply consistently across the study group. Although a difference of a few months may seem small in the context of a lifetime, previous research indicates that even modest increases in biological age are associated with small but significant rises in the risk of chronic disease, disability, and death over subsequent years.
Subsequent research has identified similar aging-accelerating effects of UPFs. For example, a study in China last year analyzed data from the UK and also found that individuals with high UPF consumption were biologically older and faced a greater risk of death than those with moderate intake.
Neither the NHANES study nor the Chinese study tracked changes in biological age over time, relying instead on snapshots. However, these findings offer a strong indication. UPFs can now be considered alongside obesity, stress, heat, and pollution as contributors to a “senesogenic environment.” The detrimental health effects of UPFs may, in fact, be primarily due to their pro-aging properties, as many diseases linked to high UPF consumption are characteristic of older age.
Addressing the Mechanism of Aging Acceleration
This observation brings forth the question of underlying mechanisms. While obesity, poor overall diet, or toxic contamination could play roles, they may not fully explain the observed effects. A significant debate surrounds whether the adverse impacts of UPFs are solely due to their poor nutritional content or if the processing itself contributes substantially.
The NHANES study lends greater support to the latter view. After accounting for the nutritional quality and energy content of diets rich in UPFs, the researchers found that these factors alone did not explain the observed increases in biological age. The study’s authors concluded that “Other properties of UPF related to processing may contribute to an acceleration of biological processes of ageing.”
The specific aspects of processing that render UPFs particularly unhealthy are still under investigation. However, the convergence of findings from two large-scale studies, utilizing different datasets and conducted in different countries, strongly associates diets high in UPFs with accelerated aging.
Practical Takeaways for Consumers
The principal recommendation is clear: avoid ultra-processed foods whenever possible. This advice, while straightforward, can be challenging to implement, as UPFs are pervasive. Even in the aforementioned studies, participants with the lowest UPF intake still consumed a considerable amount of these foods.
Nevertheless, in a world where many drivers of premature aging are unavoidable, making conscious choices about food intake can be beneficial. Opting for whole, unprocessed foods is a tangible step toward mitigating these risks. Spreading awareness about the concept of a “senesogenic environment,” influenced by factors including UPFs, is also encouraged.