07/31/2025 / By Cassie B.
Why are millions of Americans unknowingly consuming hundreds of extra calories daily, leading to skyrocketing obesity rates? The answer lies in the deceptive nature of ultraprocessed foods (UPFs), which now make up half of the average U.S. diet. A groundbreaking study published in Cell Metabolism reveals that participants consuming UPFs ate 500 extra calories per day—without even realizing it—compared to whole-food diets with identical nutrients.
Nutritional epidemiologist Filippa Juul, a leading researcher at SUNY Downstate Health Sciences University, warns that UPFs are engineered to hijack appetite regulation, promote overeating, and set children up for a lifetime of metabolic dysfunction.
In 2019, Kevin Hall, a former NIH scientist, conducted a controlled feeding study at a Bethesda research hospital. Twenty participants spent two weeks on a UPF-heavy diet (featuring chips, candy, and packaged meals) and two weeks on a whole-food diet. Despite both diets being matched for calories and macronutrients, participants unconsciously consumed 500 extra calories daily on the UPF diet, leading to measurable weight gain. Shockingly, they didn’t report feeling hungrier or more satisfied, proving UPFs bypass natural satiety signals.
A follow-up study in Japan replicated these findings, with UPF diets driving 800 extra calories per day compared to traditional meals. “This is the strongest evidence we have,” Juul told U.S. Right to Know.
UPFs are designed to be hyperpalatable, loaded with industrial combinations of fat, salt, and sugar that trigger dopamine-driven cravings. But the damage goes deeper:
Juul emphasizes that UPFs are not just “junk food”; they’re chemically altered products masquerading as food. Moreover, the food industry has essentially normalized eating anywhere and at any time using aggressive marketing tactics targeting children.
A University of Leeds study exposed that 87% of baby snacks and 79% of infant cereals are ultraprocessed. Dr. Diane Threapleton, the lead researcher, slammed these products for bearing “little resemblance to the kind of food young children should be growing up on” despite “healthy” packaging claims. The Obesity Health Alliance (OHA) condemned the industry for “flooding shelves” with sugary, addictive UPFs that set children up for a lifetime of obesity.
Juul advocates for stricter marketing bans on UPFs, especially for children, and points to countries like Chile and Mexico, which imposed taxes on sugary drinks and junk food. With obesity rates doubling globally since 1980, the evidence is clear: UPFs are a public health emergency.
Unfortunately, the UPF industry profits by keeping consumers addicted and uninformed. Until regulators crack down on deceptive marketing and restore real food to diets, the obesity crisis will only worsen.
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calories, diet, food choices, health, lifestyle, nutrition, obesity, overeating
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