Obsessive-compulsive disorder linked to piety: “The notion that a strict, possibly even God-fearing, upbringing may contribute to obsessive-compulsive disorder has been boosted by a survey which discovered that devout Catholics were more likely to show symptoms than less religious people.” From reading the article it is not possible to determine the direction of the causal link; I think it is much more likely that people’s obsessive-compulsive predispositions may contribute to their piety. New Scientist