As the country awaits two important Supreme Court decisions involving state laws on same-sex marriage, a small but consistent body of research suggests that laws that ban gay marriage — or approve it — can affect the mental health of gay, lesbian and bisexual Americans. When several states passed laws to prohibit same-sex marriage, for example, the mental health of gay residents seemed to suffer, while stress-related disorders dropped in at least one state after gay marriage was legalized.
Here's the research trail:
Beginning around 2004, several states banned gay marriage. Just before that series of bans, the National Institutes of Health happened to conduct a massive survey of 43,093 Americans. The questions elicited detailed information about respondents' mental health. (To validate what people reported about themselves, psychiatrists also interviewed samples of the people in the survey, and their medical diagnoses closely matched the findings of the survey.)