Abstract
This review observes the growing demographic of individuals identifying as transgender or non-binary, which currently represents approximately 1.3% (depending on the source) of the U.S. population. This population is shown to skew younger.Environmental xenobiotics, particularly those containing endocrine-disrupting chemicals (EDCs), are scrutinized for their role in affecting hormonal regulation crucial for gender identity differentiation. The research also highlights how exposure to pharmaceuticals with endocrine-disrupting properties may induce atypical patterns in gender identity development, suggesting that a variety of exogenous elements could impact neuroendocrine sexual differentiation.Medical disorders associated with altered androgen levels, such as congenital adrenal hyperplasia (CAH) and androgen insensitivity syndrome (AIS), are considered for their potential influence on gender identity from a biological perspective. Moreover, the role of diet and nutrition, particularly plant-based diets rich in phytoestrogens and conditions linked to obesity and metabolic syndrome, are explored for their effects on hormonal balance and, consequently, gender identity expression.This review acknowledges the significant impact of media representation and societal norms on shaping attitudes concerning gender expression and identity.The article points to psychological assessments and somatic markers as tools to explore prenatal hormone influences on gender identity, though emphasizing that they are not definitive. Furthermore, genetic and epigenetic findings offer a more in-depth understanding but lack diagnostic application. The identification and recognition of transgender and non-binary individuals continue to be self-determined processes that defy objective measurement by current medical standards.