Big data could lead to personalized medicine. Although mental health is currently one of the top global health priorities, there has been no major progress in treating psychiatric disorders since the 60s. The available therapies are ineffective, and prophylaxis is practically non-existent. To find a way out of this deadlock, psychiatry needs to consider different research approaches. One of the major obstacles for moving psychiatry forward is the enormous inter-individual variability. Patients with somewhat similar symptoms receive the same diagnosis, although the symptoms might have very different biological backgrounds. This is comparable to including migraine, hypertension and brain cancer into…