Overview

• A study of over 42,800 adults tracked for up to 26 years found those consuming 11 or more daily servings of ultra-processed foods were 2.5 times more likely to exhibit three or more early Parkinson’s symptoms compared to those eating fewer than three servings.
• Early Parkinson’s indicators assessed included sleep behavior disorders, reduced sense of smell, depressive symptoms, and impaired color vision, though constipation was not linked to ultra-processed food intake.
• The research highlights an association between diet and neurodegenerative processes but does not establish causation, with findings published in the journal Neurology on May 7, 2025.
• Ultra-processed foods studied include sugary sodas, packaged snacks, processed meats, and desserts, which are high in unhealthy additives and low in nutrients like fiber and protein.
• Experts stress the need for further studies, including dietary intervention trials, while advocating for consuming more whole, nutrient-dense foods to potentially support brain health.