Addictive Properties of Ultra-processed Foods? A Review of the Evidence for Hyper-palatable Formulations and Eating Behavior View PDF

The addictive properties of UPFs have garnered increasing scientific attention, with a growing body of evidence suggesting that these foods may possess characteristics akin to substances of abuse [1-10]. This review overviews the current understanding of the neurobiological, behavioral, and societal factors that underpin the potential for UPFs to induce addictive-like eating behaviors, emphasizing the role of hyperpalatable formulations and their impact on eating behavior.

Central to this discourse is the neurobiological basis of hedonic eating, which involves brain systems that regulate reward and motivation. Wilcox [11] highlights that food intake, especially in relation to highly palatable foods (HPFs) —those rich in sugar, fat, and ultra-processed ingredients—activates neural pathways similar to those engaged by addictive substances. Neuroimaging and animal studies reveal that HPFs can induce changes in brain chemistry, paralleling the neuroadaptations observed in substance use disorders. These alterations include increased dopamine release in reward circuits, which reinforces consumption and may lead to compulsive eating behaviors. Further supporting this perspective, Gearhardt and Schulte [12] argue that ingredients in UPFs possess reinforcing potential that can drive compulsive consumption, akin to addictive drugs. They propose that the criteria used to define addiction—such as compulsive use, psychoactive effects, and reinforcement—are applicable to HPFs, suggesting that these foods meet established scientific benchmarks for addiction. Similarly, Gearhardt and DiFeliceantonio [13] extend this argument by proposing that highly processed foods can be considered addictive substances based on criteria derived from tobacco addiction, emphasizing their capacity to cause controlled or compulsive use, mood-altering effects, and reinforcement of behavior.

The concept of hyper-palatable formulations is central to understanding the addictive potential of UPFs. Contreras-Rodriguez et al. [14] describe UPFs as formulations of ingredients designed through industrial processes to maximize palatability, often resulting in automatic recruitment of brain regions associated with food choice and consumption. This automatic activation may impair inhibitory control, particularly in the prefrontal cortex, thereby fostering compulsive eating patterns. Kelly et al. [15] further emphasize that UPFs, especially those categorized as NOVA 4, constitute a significant proportion of caloric intake in Western diets, which underscores their pervasive influence on eating behavior. The behavioral and psychological dimensions of UPF addiction are also well-documented. Ho and Verdejo- Garcia [16] adopt a multilevel framework to explore how neurocognitive systems, individual mindsets, and contextual factors interact to promote addictive eating behaviors. They highlight that the environment, including marketing and easy availability of UPFs, can reinforce compulsive consumption. Vasiliu [17] adds that the prevalence of food addiction, as measured by tools like the Yale Food Addiction Scale, is notably high— up to 20% in the general population, indicating that a significant subset of individuals exhibits behaviors consistent with addiction.The mechanistic insights into how UPFs influence brain function extend to the role of neuropeptides and neurotransmitter systems. Mehr et al. [18] focus on the orexin (hypocretin) system, which is implicated in sleep regulation and reward processing, suggesting that dysregulation in this system may link binge eating disorder and food addiction. This neurobiological overlap underscores the complex interplay between sleep, reward, and compulsive eating, further supporting the addictive potential of UPFs. Epidemiological evidence links UPF consumption with adverse health outcomes, including obesity, metabolic syndrome, and inflammatory diseases. Srour et al. [19] review data indicating that high intake of UPFs correlates with increased risk of chronic diseases, partly through mechanisms involving the gut microbiota and systemic inflammation. Forde [20] critiques the mechanistic explanations for these associations, emphasizing that the sustained effects of UPF diets on energy intake and weight gain are well-documented, although the precise pathways remain to be fully elucidated.

The clinical implications of recognizing UPFs as addictive substances are profound. Ifland and Brewerton [21] argue that the phenomenology and pathophysiology of UPF addiction overlap significantly with binge-type eating disorders, suggesting that treatment approaches from addiction medicine—such as harm reduction or abstinence—may be applicable. Similarly, the development of tools like the modified Highly Processed Food Withdrawal Scale (mProWS) by Hu et al. [22] indicates that withdrawal symptoms from UPF reduction are measurable and may influence treatment strategies. Policy and public health considerations are also prominent. Hebebrand et al. [23] describe efforts to reach a consensus among international experts on the addictive potential of UPFs, emphasizing the need for regulatory measures akin to those used for addictive substances. The potential for UPFs to impact mental health, including associations with depression and eating disorders, further underscores the importance of addressing their pervasive presence in the food environment [24].

In summary, the evidence from neuroscientific, behavioral, epidemiological, and clinical studies converges on the notion that UPFs, particularly HPFs, possess addictive properties that influence eating behavior. These foods activate reward pathways, reinforce consumption, and may lead to compulsive eating patterns similar to substance use disorders. Recognizing the addictive potential of UPFs has significant implications for treatment, policy, and public health strategies aimed at mitigating their impact on individual health and societal well-being. Continued research is essential to fully elucidate the mechanisms involved and to develop effective interventions to address this modern dietary challenge.