Spend enough time with someone and you start picking up their habits. You might steal their favorite slang, mirror their laugh, or even start looking weirdly alike in photos. According to a massive new study in Nature Human Behaviour, the overlap can go much deeper than quirks. Couples are significantly more likely to share psychiatric disorders than random chance would predict.

Researchers analyzed health data from over six million couples in Taiwan, Denmark, and Sweden. Across all three countries, partners were more likely to have conditions like depression, anxiety, ADHD, schizophrenia, OCD, bipolar disorder, anorexia, substance use issues, or autism. “We found that a majority of psychiatric disorders have consistent spousal correlations across nations and over generations,” the resear

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