What role does Insulin play in fertility?

Insulin is a key hormone in glucose metabolism that also significantly impacts fertility. In women, insulin regulates ovarian steroidogenesis and follicle development. Insulin resistance, common in PCOS (polycystic ovary syndrome), leads to compensatory hyperinsulinemia, which increases androgen production, disrupts ovulation, and impairs endometrial function. In men, impaired insulin signaling can negatively affect sperm quality and testosterone synthesis. The provided context does not contain direct studies or markers linking insulin to fertility; the statements are based on general medical knowledge. Therefore, the evidence level is considered mixed. Individual assessment should always be performed by a specialist, especially when trying to conceive.