Ultra-processed foods have long been associated with a higher risk of physical health problems, but new research suggests they may also have a significant impact on mental health.
A study conducted by researchers at Harvard Medical School and Massachusetts General Hospital found that regular consumption of ultra-processed foods particularly artificially sweetened beverages may substantially increase the risk of developing depression.
The study analyzed the dietary habits and mental health of more than 30,000 middle-aged women who had no history of depression at the beginning of the research. Participants were followed between 2003 and 2017 to examine the relationship between their eating habits and the onset of depression.
Ultra-processed foods examined in the study included bread, fast food, confectionery, cakes, salty snacks, breakfast cereals, chicken and fish nuggets, instant noodles, sugary drinks, and diet sodas.
After accounting for factors known to influence depression risk, including overall health, lifestyle, and socioeconomic status, researchers found that women who consumed ultra-processed foods daily were 49% more likely to develop depression than those with lower intake.
The researchers also observed that the risk increased with greater consumption of these foods, suggesting a dose-response relationship. They noted that artificially sweetened beverages may activate molecules in the brain that influence mood, potentially contributing to the development of depression.
Previous studies have linked ultra-processed foods to conditions such as high blood pressure, stroke, heart disease, and cancer. However, the researchers said this is among the first large-scale studies to provide strong evidence of a connection between ultra-processed food consumption and an increased risk of depression.
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