Key Insights on Testosterone & Hormones

Lesbians show more masculine finger length ratios (2D:4D) than straight women, suggesting higher prenatal testosterone exposure influences sexual orientation

• Congenital adrenal hyperplasia (CAH) in females leads to higher rates of same-sex attraction, supporting the role of prenatal testosterone in sexual orientation
• The human brain continues fetal-rate growth until age 6-10, making early development crucial for hormone-influenced neural organization and sexual differentiation
• Women have 14-fold increased Alzheimer's risk with two APOE4 gene copies due to estrogen loss in menopause
• A chef with off-the-charts microplastic levels raised testosterone to 1,200 naturally by eliminating plastic exposure over time
• Coffee machines, paper cups, and sous vide bags all expose users to endocrine-disrupting chemicals through hot liquid contact
• GLP-1 agonists improve satiety and insulin sensitivity without shutting down natural hormone production like testosterone does
• Hormone-based contraception does not impair strength, hypertrophy, or power adaptations to exercise according to multiple studies

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