Ultra-Processed Foods May Trigger Brain Changes Similar to Substance Dependencies

A recent study published this month is raising important questions about how ultra-processed foods can affect the brain. Researchers suggest that foods high in refined carbs, added sugars, and unhealthy fats may stimulate the brain’s reward system in ways that are similar to traditional substance dependence.

This does not mean that ultra-processed foods are the same as drugs. But it does suggest that certain products may be designed in ways that make them very hard to stop eating. That idea has serious implications for public health, especially as chronic diseases continue to be a public health issue across the United States.

What are Ultra-Processed Foods?

Ultra-processed foods are products that are heavily altered from their original form. They often contain added sugars, refined grains, seed oils, artificial flavors, preservatives, and other lab-developed ingredients. Some common examples include:

• Sugary cereals
• Soda and energy drinks
• Packaged snack foods
• Frozen convenience meals
• Fast food items

These products are designed for a long shelf life, strong flavor, and convenience. Many are inexpensive and widely available. But they typically offer very little nutritional value compared to whole foods like fruits, vegetables, legumes, and minimally processed proteins.

How Popular Are Ultra-Processed Foods?

Researchers use a system called NOVA to categorize “all foods and food products into four distinct groups […] based on the nature, extent, and purpose of food processing,” this new study explains. Ultra-processed foods fall into the “fourth and final group within the NOVA classification system” because of how extensively they are engineered and formulated. This group includes “soft drinks, packaged snacks, and frozen meals.”

Today, ultra-processed food products make up a large portion of the average American diet. Their growth has closely followed rising rates of obesity, type 2 diabetes, fatty liver disease, and heart conditions.

What Do UPFs Allegedly Do to the Brain?

This new study, published in the journal Pharmacological Research in February 2026, reviewed research on how these foods interact with the brain to determine whether addiction to UPFs involves the same neurochemical pathways and clinical patterns that are at play in more familiar forms of addiction. The researchers found that some foods can be addictive and create a dependence similar to that seen with alcohol or drug addiction. 

The key player is dopamine, a chemical involved in pleasure and motivation. The study authors found that UPFs “hijack” the brain’s reward circuit, “leading to behaviors that prompt the repetitive, excessive consumption of ultra-processed foods.” In other words, when someone eats foods high in sugar and fat, dopamine levels rise in areas of the brain tied to reward. That surge feels good, thereby reinforcing the behavior and making the brain want to repeat it.

Over time, this repeated stimulation may change how sensitive the brain is to reward. In some cases, people may need larger amounts of the same foods to get the same level of satisfaction, a pattern that is similar to what is seen in substance use disorders.

What Does This Mean for Me? 

Brain imaging studies have shown that people who struggle with compulsive overeating often display activity in reward-related regions of the brain that resembles patterns seen in substance dependence. Even seeing images of highly palatable foods can trigger strong responses. Some research also suggests that frequent overconsumption of UPFs may weaken parts of the brain involved in impulse control and decision-making, which can make resisting cravings even more difficult.

Furthermore, animal studies have found that removing access to high-sugar foods can lead to withdrawal-like symptoms, including behavioral changes and stress responses. While animal research does not always translate directly to humans, the similarities are notable.

What Are the Potential Health Risks of UPF Consumption?

In addition to weight gain, regular consumption of ultra-processed foods has been linked to a number of serious adverse health effects, possibly including:

• Insulin resistance and prediabetes
• Type 2 diabetes
• Nonalcoholic fatty liver disease
• High blood pressure
• Heart disease

Early exposure to UPFs during childhood is a topic of particular concern. Developing brains are more adaptable, which may increase sensitivity to strong reward signals from these highly palatable foods. A 2025 study warns that “frequent consumption of sugary and processed foods in childhood fosters a preference for sweet and highly palatable foods in adulthood, potentially reducing the intake of nutrient-dense, health-promoting options.”

Why Consumers Are Filing UPF Addiction Lawsuits

Some ultra-processed food addiction lawsuits now claim that major food manufacturers knew that their products were engineered to maximize cravings while failing to adequately warn consumers about possible health risks. These claims draw comparisons to earlier legal actions against tobacco companies. Plaintiffs argue that companies researched ideal combinations of sugar, fat, and salt to increase repeat consumption.

The lawsuits allege negligent design, misleading marketing, and failure to warn. Many also focus on advertising aimed at children, including cartoon mascots, bright packaging, and school-based promotions. Manufacturers generally maintain that consumers have personal responsibility over their diets and that their products meet regulatory standards. These lawsuits are still unfolding, but they are drawing attention to how ultra-processed foods are developed and promoted in the United States.