A study published in JAMA found that same-sex marriage policies make adolescents less likely to attempt suicide.
After examining data from the Youth Risk Behavior Surveillance System from 1999 to 2015, researchers discovered that the implementation of same-sex marriage policies led to a 7% reduction in the proportion of high school students attempting suicide. Unsurprisingly, the effect was concentrated among LGBTQ students.
LGBTQ youth are at a higher risk of suicide than their peers, likely due to the higher social stigma they face. Legalizing same-sex marriage reduces that stigma by showing LGBTQ that their relationships are valid and that they deserve the same rights as anyone else.