Cutting ultra-processed foods may ease depression symptoms, study finds
A UCSF study found that reducing ultra-processed foods led to significant improvements in depression symptoms, regardless of weight changes.
Key Takeaways
AIA preliminary study by the University of California, San Francisco (UCSF) has found that reducing the intake of ultra-processed foods may help alleviate symptoms of depression, independent of weight effects.
The study involved 20 participants who shifted from a diet high in ultra-processed foods to a healthier eating pattern. Researchers observed a marked improvement in depression symptoms after participants reduced their consumption of these foods.
The findings were published on Science Daily, citing JAMA Psychiatry. Lead researcher Dr. Andrew Crystal said the study supports the need for broader research into the link between diet and mental health.
Participants cut their intake of ultra-processed foods by more than 85 percent, resulting in moderate to large improvements across three different depression measures, with a slight improvement in anxiety scores.
Ultra-processed foods include packaged snacks, fast food, sugary drinks, and other processed products containing preservatives, artificial colors, flavor enhancers, and emulsifiers.
Dr. Nyasha Chaguidira, assistant professor in the Department of Psychiatry and Behavioral Sciences at UCSF, noted that reducing these foods is challenging due to their appealing taste, low cost, convenience, and their effect on dopamine release, which increases cravings.
The average age of participants was 44, with women making up 70 percent of the group. Fourteen participants had anxiety. All participants had a high body mass index (BMI) and at least one metabolic disorder, such as high blood pressure, diabetes, or elevated LDL cholesterol.
Chaguidira proposed the "leaky and imbalanced gut" hypothesis to explain the connection between ultra-processed foods and depression, suggesting these foods may damage the gut lining and cause low-grade chronic inflammation, which could trigger or increase the risk of depression. The researchers plan a larger follow-up study, with participant enrollment for the second phase expected to begin in 2028.