A study from the University of California, San Francisco (UCSF) suggests that cutting back on ultra-processed foods may alleviate symptoms of depression and anxiety. Ultra-processed foods are characterized by ingredients like preservatives, artificial colors, flavor enhancers, and emulsifiers, with examples including commercially sold snacks, sugary beverages, and fast food.
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The research involved 19 participants, averaging 44 years old, all of whom had been diagnosed with depression. Many also exhibited symptoms of anxiety and suffered from metabolic conditions such as obesity, high blood pressure, diabetes, or high cholesterol. Participants were divided into two groups: one maintained their regular diet for four weeks, while the other reduced their ultra-processed food consumption by over 85% with guidance from the researchers. After this period, the groups switched diets.
Results indicated that participants who reduced their intake of ultra-processed foods experienced significant reductions in their depression and anxiety levels. Specifically, the PHQ-9 depression scores dropped from an average of 8.68 to 5.53, and generalized anxiety disorder assessment scores fell from 7.37 to 4.63. Other depression severity measures, such as the MADRS and QIDS scores, also decreased by 10.8 and 3.7 points, respectively.
Dr. Nyasha Chagwedera, who led the study, explained that ultra-processed foods might adversely impact gut health, influencing mental health through potential inflammation. She noted that damage to the intestinal barrier can disrupt gut microbiota balance, possibly contributing to chronic inflammation, which may lead to or exacerbate depression.
It is important to note that this was a small exploratory study and did not establish a direct causal link between ultra-processed food consumption and depression. The research team intends to expand participant recruitment and conduct a larger study in the future. The findings were published in JAMA Psychiatry.