Study Suggests Family Background Influences Mental Health Disparities Associated with Sexual Orientation

Individuals identifying as gay, lesbian, or bisexual generally report higher levels of anxiety, depression, and other mental health issues compared to heterosexual individuals. Traditionally, these disparities have been explained primarily through Sexual Minority Stress Theory, which argues that the stress from discrimination and systemic stigma is a major contributing factor to poorer mental health outcomes among sexual minorities.

Supporting this theory, earlier studies have linked experiences of victimization with mental health distress. For instance, research highlighted by PsyPost in 2023 indicated a connection between higher levels of same-sex attraction and psychological distress, particularly influenced by experiences of victimization.

However, the current study led by Péter Przemyslaw Ujma of Semmelweis University examined whether the mental health association with sexual orientation might instead reflect shared familial factors. Researchers utilized genetically informed studies to analyze mental health outcomes between non-heterosexual individuals and their heterosexual siblings, revealing mixed results in prior investigations over the years.

For example, a 1999 study of identical male twins concluded that gay men experienced more suicidal thoughts compared to their heterosexual twins. Conversely, a 2011 twin study suggested that shared genetic and environmental factors partly explained the higher rates of depression among non-heterosexual individuals.

Ujma and colleagues conducted a systematic multilevel meta-analysis, synthesizing results from 17 qualifying studies. They distinguished between general population comparisons and family-specific comparisons, including non-twin siblings, fraternal twins, and identical twins.

Findings indicated a significant reduction in the mental health disparity as familial relatedness increased. In the general population, the mental health gap between non-heterosexual and heterosexual participants was approximately 0.41 standard deviations. This gap diminished by 47.5% when controlling for family relationships, and was reduced by 65.7% when comparing identical twins directly.

Despite this considerable drop, the remaining disparity among identical twins suggests that around one-third of the gap is attributable to factors beyond shared familial influences. They suggest sexual minority stress and varied life experiences may explain this residual gap. Ujma and his colleagues concluded that much of the disparity has been inaccurately over-attributed to minority stress.

Yiwen Wang, an assistant professor at the University of Central Florida, emphasized that while shared familial factors may account for a substantial portion of the mental health disparities, significant differences remain. She cautioned that this study should complement rather than overturn existing minority stress literature.

Additionally, the authors indicated some limitations, including the potential for publication bias and variations in the definition of sexual orientation across studies. The research noted the difficulty in disentangling genetic causes from environmental ones, stressing the need for future studies to adopt standardized clinical measures.

The study titled “How much is sexual minority stress confounded with familial causes? A systematic multilevel meta-analysis” was authored by Péter Przemyslaw Ujma, John D. Haltigan, and J. Michael Bailey.