Ultra-processed foods can alter how the human brain responds to meals even when they contain the exact same number of calories and main nutrients as unprocessed food, a study of 57 healthy adults published in Nature Metabolism shows.
Researchers discovered that consuming ultra-processed food triggered a significantly stronger insulin surge compared to eating regular food. Following the consumption of processed items, the body also demonstrated a reduced ability to utilize incoming carbohydrates as an active source of energy.
Neural imaging revealed striking differences in how the brain processed the two diet options. After participants consumed regular food, activity in both the striatum and the visual cortex increased in direct proportion to how appealing they judged the meal to be. After eating ultra-processed food, however, this neural connection became completely reversed, indicating that industrial processing alters how the brain evaluates the subjective value of food.
The investigation also established that changes in how the body processes carbohydrates were directly linked to activity levels in the striatum. The striatum is a crucial region of the brain involved in regulating eating behavior, decision-making and the perception of reward.
Defining ultra-processed foods and industrial additives
Ultra-processed foods are defined as industrial formulations that undergo multiple successive processing steps and typically incorporate an array of additives, artificial flavorings, colorings and emulsifiers. Common examples of ultra-processed products include commercial breakfast cereals, packaged savory snacks, mass-produced sweets, certain manufactured sausages, frozen convenience items and pre-packaged ready meals.
Insulin is an essential metabolic hormone produced by the pancreas that regulates blood glucose concentrations. Under typical physiological conditions, eating carbohydrates triggers insulin release, allowing body cells to absorb glucose from the bloodstream and convert it into usable energy. When insulin responses become altered or elevated, it can disrupt how efficiently the body metabolizes nutrients and stores energy.
Neural reward circuits and food perception
The striatum forms a central hub within the brain basal ganglia, operating as a core component of the dopaminergic reward system. It coordinates motivation, impulse control and habit formation, playing a major role in how humans perceive food rewards. The visual cortex, located in the occipital lobe at the rear of the brain, processes visual input and communicates with subcortical reward regions to gauge the visual appeal of food items.
Nature Metabolism is a peer-reviewed scientific journal dedicated to publishing high-impact research on metabolic regulation, cellular energy balance and systemic physiology. Studies featured in the publication frequently examine the complex interactions between dietary intake, endocrine signaling and neural pathways.
Intestinal health and dietary oxalate research
The findings add to ongoing scientific investigations into how dietary components affect internal organ function and inflammatory pathways. Separate research highlighted by the report indicates that oxalates found in foods such as spinach, beets, almonds and sweet potatoes can exacerbate intestinal inflammation in the digestive tract.
