This Week In Wellness research from the Journal of the Endocrine Society has shown that the ketogenic (or keto) diet may lower testosterone levels in women with polycystic ovary syndrome (PCOS), potentially influencing their fertility.

https://www.sciencedaily.com/releases/2023/09/230907105759.htm

https://academic.oup.com/jes/article/7/10/bvad112/7259972