Study Finds Link Between Ultra-Processed Foods and Increased Health Risks

The findings revealed that for every additional 100 grams of ultra-processed foods consumed daily, participants faced a 14% increased risk of cardiovascular events, a 4% increased risk of cancer, a 3% increased risk of all-cause mortality, and a 2% increased risk of metabolic syndrome or diabetes. Furthermore, an additional 100 grams was also associated with an 11% higher risk of high blood pressure.

Participants in the studies were followed for periods ranging from two to 32 years. Ultra-processed foods are typically packaged products that require significant industrial processing and often contain additives. Common examples include sugary beverages, processed meats, packaged snacks, candies, and other convenience items. To provide context, 100 grams is roughly equivalent to a small 3½-ounce bag of corn chips or a single-serving package of cookies.

Those with the highest intake of ultra-processed foods exhibited significantly elevated risks for various health problems. Specifically, they had a 24% higher risk of cardiovascular events, a 12% increased risk of cancer, a 23% higher risk of obesity or being overweight, and a 24% higher risk of metabolic syndrome or diabetes. There were also 27% higher rates of depression or anxiety and 31% higher rates of digestive diseases among this group.

Xiao Liu, a cardiologist at Sun Yat-sen Memorial Hospital in China and a research fellow at Duke-NUS Medical School in Singapore, led the research. The team noted that while these chronic diseases often occur together, reducing consumption of ultra-processed foods in favor of minimally processed options could aid in chronic disease prevention and primary care.

However, the study does not establish a direct causal relationship between ultra-processed foods and the identified health problems. Researchers acknowledged limitations, such as reliance on participants’ dietary self-reports and challenges in accounting for various lifestyle factors affecting long-term health. As an observational study, it looked at associations rather than assigning specific diets.

Kelly Springer, a registered dietitian based in New York who was not part of the research, emphasized the importance of the study's observational nature. She pointed out that the issue is not about entirely eliminating ultra-processed foods, but rather ensuring a balanced intake of more nutrient-dense options. Springer recommended enhancing meals with proteins and fibers, such as pairing fruit with nuts or building meals around whole grains with vegetables.

The researchers also discussed potential biological mechanisms, including food additives, changes in food structure from processing, effects on gut microbiomes, inflammation, and insulin resistance, that could explain these associations. However, they also stressed that these mechanisms do not confirm direct responsibility of ultra-processing for the observed health outcomes.

The study highlights that health risks appear to rise with increased consumption of ultra-processed foods but does not determine a specific threshold for safe consumption. The authors concluded that reducing ultra-processed food intake and opting for minimally processed alternatives may support chronic disease prevention, while further research is necessary to better differentiate the impacts of food processing from nutritional content and other lifestyle factors.