The impact of intermittent fasting on fertility: A focus on polycystic ovary syndrome and reproductive outcomes in Women-A systematic review

Abstract

Introduction

Polycystic Ovary Syndrome (PCOS) is a prevalent endocrine disorder characterized by hyperandrogenism, insulin resistance, and menstrual irregularities, leading to infertility in many women. Emerging evidence suggests intermittent fasting (IF), particularly time-restricted feeding (TRF), may improve reproductive and metabolic outcomes in women with PCOS by addressing core pathophysiological mechanisms. This systematic review examines the impact of IF on fertility and reproductive hormones in women with PCOS.

Methods

A systematic search was conducted in PubMed, Scopus, and Cochrane Library using predefined search terms related to intermittent fasting, fertility, and PCOS. Eligible studies published between 2014 and 2024 were identified following Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Inclusion criteria targeted primary research evaluating the effects of IF on reproductive outcomes, menstrual irregularities, and metabolic parameters in women with PCOS. Data extraction and quality assessment were performed using the Caldwell framework.

Results

Three studies were included in the review. TRF interventions led to significant improvements in menstrual regularity, with 33–40 % of participants reporting normalized cycles. Reductions in total testosterone, free androgen index, anti-Müllerian hormone (AMH), and luteinizing hormone (LH) levels were observed, alongside increased sex hormone-binding globulin (SHBG). TRF also improved insulin sensitivity, reduced body weight, and decreased inflammatory markers, all of which contribute to enhanced reproductive outcomes. Key outcomes included a 9 % reduction in testosterone levels, 26 % reduction in the free androgen index (FAI), and significant improvements in menstrual regularity (33–40 %).

Conclusions

Intermittent fasting, particularly TRF, shows potential as a non-pharmacological intervention to improve reproductive health and fertility in women with PCOS. By targeting hyperandrogenism, insulin resistance, and menstrual irregularities, TRF offers a promising lifestyle approach. However, larger randomized controlled trials with long-term follow-up are needed to confirm these findings and establish IF as a standard therapeutic option for PCOS management.