GLP-1 Medications and Fertility: What To Consider
GLP-1 medications like Wegovy (semaglutide), Ozempic (semaglutide), Mounjaro (tirzepatide), Saxenda (liraglutide), and Zepbound have transformed the way we approach weight management and metabolic health. More recently, people trying to conceive have started asking whether these medications can help with fertility. The answer is nuanced. While GLP-1 medications are not fertility treatments, emerging evidence suggests they may improve fertility-related outcomes in some individuals, particularly those living with obesity or polycystic ovary syndrome (PCOS), also known as polyendocrine metabolic ovarian syndrome (PMOS). Understanding how these medications work, and how they fit into a broader fertility and pre-conception plan, is important.
As a dietitian specialising in metabolic health and fertility, I want to explain how these medications work, what the research says about fertility, and why working with a dietitian is the real key to success.
GLP-1 medications mimic a natural hormone called glucagon-like peptide-1. They help slow digestion, reduce appetite, improve insulin sensitivity, and stabilise blood sugar. Newer medications like Mounjaro and Zepbound also target glucose-dependent insulinotropic polypeptide (GIP) receptors, giving extra metabolic support. In other words, they make it easier to eat less, feel fuller for longer, and keep blood sugar steady, all important for overall health and, indirectly, fertility.
Why Metabolic Health Matters for Fertility
Fertility and metabolic health are closely linked. Obesity, insulin resistance, and poor glycaemic control can affect reproductive function through a variety of mechanisms, including disruption of ovulation and alterations in hormone regulation.
In individuals with obesity or PCOS, improving metabolic health may help address some of the factors associated with reduced fertility. Weight loss, improved insulin sensitivity, and better blood glucose regulation have all been associated with improvements in reproductive health outcomes.
Some fertility clinics use Wegovy or semaglutide before IVF to optimise metabolic health and weight. Early research is exploring whether pre-treatment could improve embryo quality or endometrial receptivity, but so far the strongest advantage is improved metabolism and healthier weight, both of which support fertility and treatment outcomes. However, it's important to note that GLP-1 medications cannot be used during pregnancy. UK regulators, including the MHRA, advise discontinuing the medication before trying to conceive and following a recommended washout period, typically one to two months.
Additionally, these medications can reduce the effectiveness of oral contraceptives, so additional or non-oral contraception is needed if you’re taking it while still on birth control.
In essence, It’s essential to plan the timing and use of these medications carefully with your healthcare team if fertility is your goal.
Why Working With a Dietitian Is Particularly Important When Fertility Is the Goal
GLP-1 medications can be highly effective for weight loss, but when fertility is the goal, the focus needs to be on more than simply seeing the number on the scales decrease. Because these medications significantly reduce appetite, some people unintentionally eat too little or struggle to consume enough protein, fibre, vitamins, and minerals. While this may accelerate weight loss, it does not necessarily support optimal reproductive health.
The pre-conception period is a critical time to build nutrient stores and optimise overall health before pregnancy. Nutrients such as folate, iron, iodine, vitamin D, vitamin B12, choline, omega-3 fats and adequate protein all play important roles in supporting maternal health and early foetal development. In some cases, rapid or poorly planned weight loss may also increase the risk of losing lean body mass alongside body fat. Preserving muscle mass is important for maintaining metabolic health, particularly when preparing for pregnancy.
Another challenge is that appetite suppression can sometimes mask underlying eating patterns. Some individuals find themselves skipping meals, relying on very small portions, or struggling to establish consistent eating habits. While this may result in short-term weight loss, it can make the transition off medication more difficult when appetite naturally returns before conception.
I work with clients to help ensure that weight loss is achieved in a way that supports both metabolic health and reproductive health. This includes maintaining adequate protein intake, identifying potential nutrient gaps, supporting healthy eating behaviours, and creating a sustainable plan that can be continued once medication is discontinued.
For individuals using GLP-1 medications to improve fertility outcomes, the goal is not simply to lose weight. The goal is to improve health, optimise nutritional status, and enter pregnancy in the best possible condition for both parent and baby.
The key to long-term success is working with a dietitian to help ensure weight loss is safe, balanced, and tailored to reproductive health, protect muscle and metabolism, and guide the transition off medication so the fertility gains are sustained. GLP-1 medications open the door, but a dietitian ensures you walk through it safely and that your fertility is truly supported. If you're interested in learning more about how I can help support you, click here to get yourself booked in for a free discovery call.