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How does food affect our brain? Can depression be caused by an alteration in the gut microbiota? How does the microbiota affect cognitive functions: memory, attention, emotional regulation? Sari Arponen has a PhD in Biomedical Sciences from the Complutense University of Madrid, is a university professor and expert in microbiota. Graduated in Medicine from the University of Murcia, she specialized in Internal Medicine at the Hospital Universitario de la Princesa in Madrid. She has a master's degree in Infectious Diseases and another in HIV, a three-year postgraduate degree in Clinical Psychoneuroimmunology from the Pontifical University of Salamanca, and is a University Expert in Nutrition.