New research using brain scans has confirmed what many nutritionists have long suspected: ultra-processed foods do not just harm the body, they fundamentally alter how the brain functions. The findings, which stunned the US research team behind them, are adding scientific weight to calls from Australian farmers for a return to whole, unprocessed food.
What the Brain Scans Actually Showed
A team of neuroscientists, led by Associate Professor Alex Di Feliceantonio from Virginia Tech, recruited 60 participants and used brain imaging to compare their responses to healthy meals and ultra-processed meals, even when both meals contained identical levels of sugar and fat.
The results were striking from the outset. "Really from the beginning as the data started coming in, it was different on almost every measure," Di Feliceantonio said.
The ultra-processed meals triggered a distinct metabolic response and activated a region of the brain directly linked to motivation and reward, essentially the same circuitry associated with addictive behaviour. On top of that, the unhealthy meals caused insulin levels to spike and kept blood sugar elevated for significantly longer than their healthy equivalents, despite having the same nutritional profile on paper.
The key takeaway from the research is both alarming and, according to Di Feliceantonio, hopeful. "What you eat does change your brain," he said, adding, "If you change your diet, you can change your brain."
Ultra-processed products are engineered to deliver an intense burst of flavour that fades quickly, keeping consumers reaching for another hit. Salt, fat, sugar, preservatives, additives and artificial flavours are the tools of that design.
Australia's Ultra-Processed Food Problem
The research also placed Australia's eating habits in uncomfortable global context. While Americans derive roughly 55 per cent of their daily calories from ultra-processed foods, Australians are not far behind at approximately 42 per cent, ranking the country fourth in the world for calories consumed from such products.
That figure is likely to worsen. CSIRO modelling projects that by 2030, Australians will be eating 10 per cent less fruit and consuming even greater quantities of junk food than they do today, suggesting the trajectory is heading in the wrong direction despite growing public awareness.
Farmers Calling for a Return to Basics
For Sallie Jones, who runs Gippsland Jersey, a Victorian dairy operation that farms fresh local milk and sells it directly to consumers without additives, the research resonates personally as well as professionally.
"Our population is getting sicker and sicker and sicker," she said. Jones described watching the effects of processed food up close at home, noting she has a child who struggles with sugar addiction and that the impact on his behaviour and emotions is clear.
Her business, one of a growing number of Australian food brands pushing back against industrialised food production, operates a small store stocking healthy, unprocessed products alongside its signature milk. She sees consumer awareness as the most powerful force for change.
"As the years go on, the consumer is getting smarter, so I can't see us going backwards," Jones said. "Once you know, you know, and you can't unlearn what you know."
The shift toward whole foods remains modest in scale, but advocates argue it is gaining momentum. For farmers like Jones, the science now backs what they have been saying on the ground for years. And for researchers like Di Feliceantonio, the brain scan data gives that argument a new and hard-to-ignore dimension. You can also read about how Australian farmers are finding innovative ways to protect their livelihoods, as pressure on the sector continues to grow.
