Why everything you’ve heard about ultra-processed foods and overeating could be wrong; the surprising truth about what really drives your craving

Ultra-processed foods (UPFs) have long been vilified as the primary culprits behind overeating and the obesity epidemic. These factory-made products, including crisps, ready meals, fizzy drinks, and packaged snacks, are often blamed for a range of modern health problems, from obesity to cognitive decline. However, a groundbreaking study by researchers at the University of Leeds challenges this narrative, suggesting that our perceptions and beliefs about food play a more significant role in overeating than the food's level of processing.

In an analysis involving over 3,000 UK adults, researchers examined how participants rated more than 400 everyday foods for their likability and the likelihood of overeating. The study compared these responses with the foods' nutritional content (fat, sugar, fiber, energy density), their classification as ultra-processed by the NOVA system, and how people perceived them (e.g., sweet, fatty, processed, healthy).

The findings revealed that while nutrient content influenced food preferences, people rated high-fat, high-carb foods as more enjoyable and more likely to lead to overeating, what mattered more was how individuals perceived the food. Foods believed to be sweet, fatty, or highly processed were more likely to trigger indulgence, regardless of their actual nutritional content. Conversely, foods perceived as bitter or high in fiber were less likely to be overeaten.


Notably, the classification of a food as "ultra-processed" added very little to the predictive models for overeating. Once nutrient content and food perceptions were accounted for, the NOVA classification explained less than 2 percent of the variation in liking and just 4 percent in overeating. This suggests that labeling a food as ultra-processed does not significantly influence our eating behavior.

That doesn’t mean all ultra-processed foods (UPFs) are harmless. Many are calorie-dense, low in fiber, and easy to overeat. However, the UPF label is a broad category, grouping together sugary soft drinks, fortified cereals, protein bars, and even vegan meat alternatives. The idea that all UPFs are unhealthy oversimplifies things. People don’t choose foods solely based on labels, they consider taste, how a food affects them, and how it aligns with their health, social, or emotional goals.

The study also highlighted that hedonic overeating, the act of eating for pleasure rather than hunger, is influenced not just by the nutritional characteristics of foods but also by individual beliefs and perceptions. These findings underscore the complexity of eating behaviors and suggest that interventions should focus on altering perceptions and beliefs about food rather than solely on its level of processing.

Researchers and experts advocate for a more informed and personalized approach to nutrition. This includes boosting food literacy to help individuals understand what makes food satisfying and how to recognize personal cues for overeating. Additionally, reformulating food products to be enjoyable and filling, rather than relying on bland "diet" options or ultra-palatable snacks, can support healthier eating habits.

Addressing these psychological factors may be key to developing more effective strategies for promoting healthier eating habits and combating the obesity epidemic. It's time to stop demonizing food groups and start focusing on the psychology behind our choices.