UCSF: Cutting Ultra-Processed Food Improves Depression — SkimNews
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- UCSF researchers found that 20 depressed participants who cut ultra-processed food intake by more than 85% showed moderate to large improvements across three measures of depression, with anxiety scores also improving modestly.
- The crossover study design — two groups each spent four weeks on their usual diet before switching — made this the first trial to track the same depressed patients before and after a dietary overhaul, published Sept. 23 in JAMA Psychiatry.
- Senior author Andrew Krystal called the pilot a proof of concept for a larger trial, with phase 2 enrollment expected to begin in 2028.
- All 20 participants had a high BMI and at least one metabolic disorder such as hypertension, diabetes, or elevated LDL cholesterol; 14 also had anxiety, and 70% were female with an average age of 44.
- Corresponding author Nyasha Chagwedera proposed a 'leaky gut' mechanism — ultra-processed food damages the gut lining, triggering chronic inflammation that may cause or worsen depression — and noted that food companies engineer products to maximize cravings.
- The study was funded by the NIH's National Center for Advancing Translational Sciences through UCSF-CTSI, plus grants from NHLBI and NIMH.
Why it matters: This is the first study to track the same depressed patients before and after a major dietary shift, lending rare clinical weight to a diet-depression link — especially relevant because all 20 participants also had metabolic conditions like diabetes or high cholesterol, populations that overlap heavily with depression. A larger phase 2 trial is planned for 2028.
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