Many factors can influence the success of IVF treatment, and every fertility journey is unique. One factor often underestimated is Body Mass Index (BMI).
BMI is used, not only in the UK but also worldwide, to determine a 'healthy weight'. While BMI is not a perfect measure, as it can be influenced by factors such as muscle mass and ethnicity, it is the simplest and most accessible way to assess whether someone falls within a recommended weight range.
We recognise the sensitivity surrounding this topic and aim to provide a comprehensive exploration of BMI without judgment, emphasising its impact on IVF treatment outcomes, so that you can make informed decisions with confidence.
Understanding BMI
You've likely come across the term BMI at a doctor's appointment, during a health assessment, or through informational resources covering health and wellbeing.
BMI is a numerical value based on weight and height used to indicate overall body fat. You can use the NHS calculator to determine your BMI.
The resulting number falls into one of several categories. As determined by the NHS, the categories and corresponding BMI ranges are as follows:
- Under 18.5 – This is described as underweight
- Between 18.5 and 24.9 – This is defined as the 'healthy range'
- Between 25 and 29.9 – This is described as overweight
- 30 or over – This is described as the obese range
It’s worthwhile noting that BMI doesn’t distinguish between muscle mass and excess fat. Particularly muscular people, such as athletes and weight trainers, may accidentally be classed as overweight or obese despite being in optimal health.
How can BMI affect the success of IVF treatment?
There are several ways in which your BMI can influence both your fertility and the outcomes of IVF treatment, highlighting the important connection between the two. Therefore, it's beneficial to understand the implications before seeking fertility treatment.
Egg quality and quantity
BMI can impact the quality and quantity of eggs produced during IVF. Studies have shown that women with a BMI in the optimal range tend to produce more high-quality eggs, increasing the chances of embryo development and successful fertilisation.
Response to fertility medications
BMI can affect how your body responds to fertility medications used in IVF. Individuals with a high BMI might require higher doses of these medications, increasing the risk of side effects. Those with a low BMI may not respond as well to medications, resulting in fewer eggs being retrieved.
Hormonal imbalances
BMI can influence hormone levels in your body, including insulin and sex hormones, such as oestrogen and testosterone. These hormonal imbalances can disrupt ovulation and affect embryo implantation.
What is the ideal BMI for IVF treatment?
At Essential Fertility® we recommend you have a BMI between 18-32. This is to ensure you have the best chance at a successful pregnancy. Our Manchester Fertility pathway can accept patients with a BMI up to 35 however, in order to give you the best chance of success it is always advisable to make lifestyle adjustments to achieve a healthy BMI, if possible.
How can I reach an optimal BMI for IVF treatment?
At Essential Fertility, our specialised staff can provide advice, support and recommendations for improving BMI to help reach treatment criteria. They will guide you in the following areas:
Focus on a balanced diet
Nutrition plays a vital role in managing your BMI. Aim for a well-balanced diet that includes a variety of fruits, vegetables, lean proteins, whole grains, and healthy fats. Avoid crash diets where possible or extreme restrictions, as they can negatively impact your fertility.
Regular exercise
Incorporate regular physical activity into your routine. Exercise can help you achieve and maintain a healthy BMI, improve hormonal balance, and reduce stress – all factors contributing to IVF success.
Weight loss or gain, if necessary
If your BMI falls outside the ‘healthy range’, weight loss or gain may be advised to optimise your chances of IVF success. However, it's essential to approach these changes gradually with professional guidance.
Emotional support
Beginning IVF can bring a wide range of emotions, and it’s completely normal to feel overwhelmed at times. Many people find comfort in seeking support from friends, family members, or fertility support groups as they navigate treatment.
If you proceed with treatment at Essential Fertility, professional counselling support is available to you, offering a safe space to talk openly and receive guidance whenever you need it.
How else can I be healthy for IVF?
As well as a balanced diet and regular exercise, we also recommend avoiding smoking and drinking alcohol during treatment. Getting the right amount of sleep can also help support an IVF cycle.
What if my BMI isn’t ideal for IVF?
To be eligible for Essential IVF®, the individual undergoing treatment would need to meet the following criteria:
- Under 37 years old
- With a BMI between 18 and 32
- AMH between 10 and 35
If you have a BMI over 32 or don't meet the other additional criteria, you can contact Manchester Fertility today. Our friendly team will support you if your medical history is a little more complex.
Moving forward with confidence
Achieving and maintaining a healthy BMI can enhance your chances of IVF success and contribute to a healthier pregnancy. Everyone is unique, so we always recommend speaking to one of our specialist team about ways to increase your chances of success with IVF treatment. We aim to create a treatment plan aligning with your individual needs.
It's important to emphasise that BMI is not intended to stigmatise anyone; our purpose is to empower you with the best possible chance of pregnancy and parenthood through IVF. Your journey with us is marked by care and understanding.
Get started
If you are considering Essential IVF® treatment, you can call us on 0345 305 2707 to discuss your options. Alternatively, you can request a callback from our friendly team or make an appointment to see one of our senior Essential Fertility nurses.
