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Kids who eat more ultra-processed foods show stronger brain reward responses to tempting food images — and that brain activity is linked to greater weight gain a year later. A USC study of 46 children aged 7–10, published in JAMA Network Open, found that heightened activity in the brain's reward center explained up to 44% of the link between ultra-processed diets and increased body fat.
A new USC study published in JAMA Network Open suggests that ultra-processed foods (UPFs) don't just add calories — they may also influence how children's developing brains respond to food. Researchers scanned the brains of 46 healthy-weight kids aged 7–10 while they viewed images of tempting foods like cookies and fries. Kids who ate more UPFs showed significantly stronger activity in the dorsal striatum, the brain's reward and motivation hub.
Those heightened brain responses weren't just a snapshot — they predicted the future. Children with stronger reward-region activity went on to gain more body fat and had higher BMIs one year later, suggesting the brain's food-cue sensitivity may be a key biological link between ultra-processed diets and obesity.
By the Numbers
Why it matters: Children's brains are still forming habits and food preferences, making early intervention critical. These findings offer a neurobiological explanation for why ultra-processed diets may drive weight gain — and underscore the need for systemic changes to make healthier foods more accessible, not just individual willpower.
