Expert Reaction: Weight Loss & IVF Review Study
Weight Loss Can Improve fertility in Women with Obesity, new Study Finds
Table of Contents
Obesity is a significant and growing contributor to infertility in women, and new research published in the Annals of Internal Medicine suggests that even modest weight loss can substantially improve chances of conception, both naturally and through assisted reproductive technologies like IVF. The study, led by Moscho Michalopoulou, reinforces the importance of addressing weight as part of fertility treatment and highlights potential inequities in access to care.
The Link Between Obesity and Infertility
Obesity disrupts crucial hormonal processes impacting reproductive health. As dr. Channa Jayasena, Associate Professor/Consultant in Reproductive Endocrinology at imperial College London, explains, “Obesity can disrupt periods, and how the ovaries and womb work.” It also considerably increases the risk of pregnancy complications. These disruptions are a key reason why the National Institute for Health and Care Excellence (NICE) guidelines currently restrict NHS funding for fertility treatments like IVF for women with obesity.
Meta-Analysis Shows Weight Loss boosts Pregnancy Rates
The recent meta-analysis examined data from multiple studies investigating the impact of weight loss on fertility outcomes. the findings demonstrate a clear association between weight loss prior to fertility treatment and increased pregnancy rates. While the study showed improved chances of pregnancy, it wasn’t definitively clear whether IVF itself became more effective after weight loss, suggesting the benefits may extend to natural conception as well.
Importantly, the average weight loss achieved in the analyzed studies was less than one stone (5kg), indicating that even relatively small reductions in weight can have a positive impact. This is encouraging news, as it suggests achievable goals can significantly improve a woman’s chances of becoming pregnant.
Implications for Access to IVF and Future Research
The current BMI threshold (<30) for accessing NHS-funded IVF in the UK presents a barrier for many women. The research underscores the potential for safe and effective weight loss interventions to expand access to treatment. Dr. Jayasena notes, "Establishing reliable, safe, and effective weight loss interventions could enable thousands of patients to access timely IVF treatments and achieve healthier pregnancies with reduced risks." However, further research is needed to fully understand the optimal strategies for weight loss in this context. the initial analysis highlights the need for adequately powered trials and more data on live birth outcomes. Specifically, researchers are investigating whether intensive weight loss interventions - such as GLP-1 agonists or high-intensity dietary regimens - can restore natural fertility and reduce reliance on assisted conception.It is indeed crucial to note that GLP-1 agonists are not recommended during pregnancy or when actively trying to conceive. Additionally, more data is required to assess the long-term benefits of these interventions for both mother and child.
Addressing Health Inequities
The impact of obesity disproportionately affects those from lower socioeconomic backgrounds. Dr. Jayasena points out that weight loss interventions could “help disadvantaged couples have a baby when other avenues like IVF are not open to them.” This highlights the potential for weight management programs to address both a public health issue and a social justice concern.
key Takeaways
Even modest weight loss (around 5kg) can improve fertility in women with obesity.
weight loss can increase the chances of pregnancy both naturally and with IVF. Current BMI restrictions for NHS-funded IVF create inequities in access to treatment.
Further research is needed to determine the best weight loss strategies for women seeking to conceive and to assess the long-term effects of these interventions.
‘The Effect of Weight Loss Before In Vitro Fertilization on Reproductive outcomes in Women With Obesity’ by Moscho michalopoulou was published in the Annals of Internal Medicine on August 11, 2025.
DOI: 10.7326/ANNALS-24-01025
Expert Commentary: Dr. Channa Jayasena, Associate Professor / Consultant in Reproductive Endocrinology, Imperial College London.
Declared interests: Prof Ying Cheong: “no COI to declare.” Prof Bassel Wattar: “No conflict of interest to declare.” Dr Chena Jayasana: “No conflicts.”