Chapter 16 (in part)

The World Reacts to Fructose

“Americans will always do the right thing, but only after trying everything else.” — often attributed to Winston Churchill

I t began in America, this fructose epidemic. High-fructose corn syrup (HFCS), subsidized by farm bills, promoted by corporate food giants, and hidden in nearly every shelf-stable product, was exported to the world. What followed these exports was obesity, diabetes, liver disease, and cardiovascular death on a scale no single nutrient had ever caused.


16.1: A Global Crisis Reframed

Between the 1980s–1990s, U.S. corn production surged due to subsidies under the Farm Bills, making corn-derived products like high fructose corn syrup (HFCS) artificially cheap.

Multinational food and beverage companies (e.g., Coca-Cola, PepsiCo) replaced cane sugar with subsidized HFCS in sodas and snacks to cut costs, exporting these products globally. Trade agreements like NAFTA (1994) eliminated tariffs, enabling HFCS and processed foods to flood markets in Mexico, Canada, and beyond. By the 2000s, HFCS became ubiquitous in soft drinks, baked goods, and processed foods worldwide.

The worldwide prevalence of obesity more than doubled between 1990 and 2022. By the early 2000s, it had become clear that the global rise in obesity, diabetes, and fatty liver disease could not be explained by fat intake or sedentary lifestyles alone. Even in countries with stable caloric intake, chronic diseases were climbing. Researchers began to suspect that the culprit was not just what people ate—but how it was made.


16.2: Scientific Foundations (2007–2015) NOVA and Nutri-Score

The defining shift came from Brazil, where public health researcher Carlos Montessori and his colleagues at the University of São Paulo proposed a radical reframing of nutrition science. Instead of measuring food by its nutrient content, they classified it by its degree of processing.
The result was the NOVA classification system, introduced in its full form by 2009, and rapidly adopted by researchers across Latin America and Europe. NOVA grouped foods into four categories, from unprocessed to ultra-processed, and linked the fourth group—ultra-processed foods (UPFs)—to weight gain, inflammation, and metabolic disease, regardless of calorie count or fat content [1,2].

The diagram below, with permission from Dr Monteiro, shows the four categories of processing in food

This model explained the disconnect: why diets full of “low-fat” or “reduced-calorie” foods still caused disease. It wasn’t about fat. It wasn’t even about sugar alone. It was about engineered foods—industrially produced products loaded with emulsifiers, synthetic flavors, refined starches, and added fructose—that hijacked satiety, disrupted metabolism, and drove addiction-like consumption [3].

UPFs were no longer considered harmless conveniences. They were biochemical hazards, and they had quietly become dominant in the food supply of every modern country. What followed was an explosion of research.

The science behind ultra-processed foods matured rapidly between 2007 and 2015. Researchers around the world began publishing large-scale cohort studies and controlled trials that confirmed what Monteiro had hypothesized. Among the first was Barry Popkin, whose 2007 paper on the global “nutrition transition” identified a sharp rise in diet-related disease across low- and middle-income countries as they adopted Western-style packaged foods [4]. His work laid the groundwork for understanding the planetary spread of UPFs as a unified dietary threat.

Then came the data. In France, the NutriNet-Santé cohort was launched in 2009 and rapidly grew into one of the largest nutritional epidemiology databases in the world. By 2018, its findings were unequivocal: higher consumption of ultra-processed foods was independently associated with obesity, hypertension, cardiovascular disease, and breast cancer—even after adjusting for calories, sugar, and fat [5,6].

At the same time, the case against fructose was building. In 2012, Robert Lustig published a widely cited paper in Nature declaring that added sugar—and fructose in particular—should be regulated like alcohol due to its unique effects on liver metabolism and insulin signaling [7]. Lustig, along with other researchers, had shown that fructose bypasses the key regulatory step of glycolysis and is rapidly converted to fat in the liver, leading to de novo lipogenesis, ATP depletion, and uric acid generation [8].

In 2013, Te Morenga et al. published a meta-analysis in BMJ showing that dietary sugar was associated with weight gain across both children and adults, independent of total calories [9]. The same year, a landmark study by Hall et al. at the NIH proved that people on ultra-processed diets consume more calories and gain more weight—even when calories, protein, fat, sugar, and fiber were controlled—confirming that something inherent in food processing was metabolically disruptive [10].

Further support came from cancer research. In 2015, French investigators demonstrated that UPF consumption was strongly associated with breast cancer risk in women—an association later confirmed in the broader NutriNet-Santé database [6]. Animal studies and mechanistic trials reinforced the connection between high-fructose diets and tumor growth, especially in the liver, breast, and colon [11,12].

What was emerging was not a loose collection of hypotheses, but a convergent scientific framework: ultra-processed foods, particularly those high in added fructose, were biologically active drivers of metabolic dysfunction. They were not inert calories—they were engineered compounds designed for profit, not for health.