Ultra-Processed Foods: A Deeper Look

Ultra-processed foods (UPFs) have become a hot topic in nutrition discussions. These factory-made items—like chips, frozen meals, sugary drinks, and packaged snacks—are frequently blamed for a range of health issues, from obesity to potential links with dementia and what some describe as “food addiction.” Certain experts believe these products are engineered and marketed to boost consumption and profit, effectively hijacking our brain’s reward mechanisms, encouraging us to eat more than we really need.

In response, policymakers are suggesting various measures, such as warning labels, restrictions on advertising, taxes, and possibly even bans near schools. But how much of this urgency stems from solid evidence?

To delve deeper, my colleagues and I decided to investigate what actually influences people’s food preferences. We examined what urges people to overeat—not just enjoy food, but keep eating even when they’re no longer hungry. Our study involved over 3,000 UK adults and their reactions to more than 400 common foods. What we discovered challenges the oversimplified narrative about UPFs and suggests a more complex understanding.

In nutrition talks, two concepts often blend together: enjoying a food and hedonic overeating, which is eating for pleasure rather than necessity. Enjoyment relates to taste, while hedonic overeating is driven by the pleasure a food provides. They’re interconnected but distinct. For instance, while many enjoy porridge, it’s not something people typically binge on. Conversely, chocolate, cookies, and ice cream frequently appear on both lists.

We conducted three extensive online studies where participants evaluated photos of unbranded food portions based on their likes and the likelihood of overeating. The foods were easily recognizable items from a typical UK grocery list: baked potatoes, apples, noodles, shepherd’s pie, and custard creams—over 400 in total.

We analyzed these preferences alongside three factors: the nutritional content (fat, sugar, fiber, energy density), classification as ultra-processed using the widely recognized Nova system—a method that categorizes foods based on their processing extent and purpose—and people’s perceptions of the foods (like whether they seemed sweet or healthy).

The Influence of Perception

Some findings were as expected: people tend to enjoy foods they consume often, and calorie-rich foods are more likely to lead to overeating.

However, the role of beliefs and perceptions offered a surprising insight. Nutritional content played a part, with people finding high-fat and high-carb foods more pleasurable. Yet, their beliefs about food had a substantial impact too. Foods perceived as sweet, fatty, or highly processed increased overeating likelihood, regardless of actual nutritional content. In contrast, foods thought to be bitter or high in fiber often had the opposite effect.

In one survey, we found that we could predict 78% of the differences in individuals’ overeating tendencies by combining nutrient data and beliefs about food.

In essence, our thoughts about food influence how we consume it, just as much as the actual ingredients do.

This leads us back to the subject of ultra-processed foods. Despite heavy scrutiny, identifying a food as “ultra-processed” added minimal value to our predictive models.

When we factored in nutrient content and perceptions, the Nova classification explained less than 2% of the differences in food enjoyment and just 4% in overeating.

This doesn’t imply that all UPFs are healthy. Many are high in calories, low in fiber, and easy to overindulge in. Nevertheless, the UPF designation is too broad. It lumps together totally different items, like sugary sodas with fortified cereals and protein snacks with vegan meat substitutes.

While some of these products may have health drawbacks, others can be beneficial—especially for seniors with limited appetites or others with special dietary needs.

A Simplistic View

The narrative that everything categorized as UPF is harmful oversimplifies the matter. People don’t eat based solely on labels. They consider taste, how food makes them feel, and how it aligns with their health or emotional objectives.

Depending too heavily on UPF classifications for policy could backfire; warning labels might deter consumers from eating foods that are genuinely beneficial, like wholegrain cereals, or create confusion regarding what’s unhealthy.

We propose a more nuanced, personalized strategy:

• Enhance food literacy: Educate individuals about satisfaction, cravings, and recognizing their personal overeating triggers.
• Intentional reformulation: Create food products aimed at being enjoyable and filling instead of relying simply on bland diet options or overly appealing snacks.
• Address eating motivations: Acknowledge that people eat for various reasons beyond hunger—like comfort and connection. Encouraging alternative habits while maximizing enjoyment could help reduce reliance on poor-quality foods.

Beyond Processing

Some UPFs certainly warrant concern: they’re calorie-dense and often marketed aggressively in large portions. However, they shouldn’t be treated as a universal villain.

Classifying entire food categories as harmful simply based on their level of processing neglects the complexities of eating behavior. What influences our eating decisions is complicated, yet understandable. We now have the data and tools necessary to unravel these motivations and help individuals adopt healthier, more fulfilling diets.

Ultimately, the nutritional qualities of food—along with our perceptions of them—are more significant than whether they come in a package. To foster healthier eating behaviors, it’s time to move past vilifying specific food groups and focus on the psychological aspects of our choices.