Ultra-Processed People: Why Do We All Eat Stuff That Isn’t Food … and Why Can’t We Stop?: Summary & Key Insights

To understand the effects of ultra-processed foods not just from a theoretical standpoint but through lived experience, I transformed myself into both doctor and patient. For a month, I consumed a diet where 80 percent of my calories came from UPFs — the kind of foods that make up most modern supermarket shelves: breakfast cereals, snack bars, packaged breads, ready meals, and flavoured yogurts.

At first, it was almost fun. The convenience was alluring, the flavours intense. But within days I began to feel the difference. I was hungrier, more irritable, and sluggish in ways I hadn’t anticipated. I gained weight quickly — nearly seven kilograms by the end of the month — and brain scans revealed something far more profound: my reward centres had lit up as if I were consuming addictive substances. Neuroscientific studies have shown that hyper-palatable combinations of fat, sugar, and salt uniquely stimulate dopamine release, hijacking the brain’s normal mechanisms for satiety.

The experiment wasn’t meant as self-punishment; it was an act of translation. By turning my body into a case study, I wanted to demonstrate what the science already tells us but what the food industry prefers to keep vague: UPFs are not inert calories. They change our metabolism and psychology in ways that natural foods do not. My appetite regulation became distorted, my sleep worsened, and I felt increasingly detached from my own hunger cues. These weren’t just subjective impressions — they were the predictable outcomes of a system that treats food as data, optimized to make us consume more and crave more.

That month of eating didn’t just alter my body; it transformed my perception of modern eating. It showed me that personal willpower is no match for industrial design. When everything around you is created to override your biology, no amount of discipline can fix the problem alone.

At the center of the book lies a deceptively simple question: what exactly counts as ultra-processed? The answer lies in the NOVA classification system, a framework developed by researchers at the University of São Paulo. Unlike calorie-based or nutrient-based definitions, NOVA categorizes foods by how much they are transformed from their original state.

Ultra-processed foods occupy the fourth and highest level of this scale. They are industrial formulations of ingredients extracted from whole foods, often recombined with synthetic additives and assembled in factories rather than kitchens. Their purpose is convenience, consistency, and profit, not nourishment. A loaf of traditional sourdough made from flour, water, and salt is minimally processed; a packaged ‘whole-grain’ loaf stuffed with emulsifiers, stabilizers, and artificial scents is ultra-processed.

The distinction matters because processing isn’t inherently bad. Cooking, fermenting, grinding — these are deeply human acts. Ultra-processing, however, takes the act away from human hands and embeds it within an industrial logic. When food becomes data — measured in shelf life, margins, and sensory optimization — the human element disappears. What remains is a product designed to stimulate rather than sustain.

Understanding this boundary allows us to see that we are not the intended consumers in the traditional sense — we are data points in an optimization loop. This understanding reframes food choices not as personal moral decisions, but as consequences of an economic model built on manipulating biology for profit.