Why is having a healthy BMI important for surrogates? Women who have decided to become surrogates are sometimes surprised to face stringent health criteria, particularly when it comes to their height to weight ratio. And while being overweight does not necessarily disqualify you as a surrogate, a Body Mass Index (BMI) of 33 or less is required by most fertility clinics. Marinating a healthy BMI supports your fertility, improves pregnancy outcomes, and lowers the risk of complications for you and the baby.

  • Having a high BMI puts you at greater risk of developing health problems.
  • Healthy BMI supports fertility, pregnancy health, and embryo implantation.
  • Maintaining a heathy BMI reduces the risks of developing health and pregnancy complications.

Health Risks Associated with High BMI

The higher your BMI, the greater your risk of developing health problems. In most cases, it means you have a higher percentage of body fat, which may increase your risk of:

  • Cardiovascular disease
  • High cholesterol
  • Sleep apnea
  • Hypertension
  • Arthritis
  • Diabetes or Gestational diabetes
  • Many forms of cancer

These are serious conditions that can harm not only the health of your surrobaby. Being overweight or obese can affect nearly all the components of the reproductive system, from the function of your eggs to the quality of embryos and even your uterus itself. Higher body fat is also associated with an increased risk of miscarriage in the first trimester and recurrent miscarriages, even women trying to conceive naturally.

Lower IVF Success Rates

Several studies have shown that being obese can reduce the success of IVF outcomes. A high BMI is linked to:

  • Lower fertility rate
  • Lower success rates with fertility treatment
  • Higher rate of miscarriage

One particular study from the American Society for Reproductive Medicine found women of normal weight who underwent IVF had an implantation rate of 24%, while the rate for overweight women was only 15%. This finding was backed by previous studies that have suggested overweight women require higher doses of fertility medications, are less likely to get pregnant and have higher miscarriage rates.

Lower Embryo Implantation Rates

Obesity reduces endometrial receptivity. Women with higher BMIs are found to have significantly lower implantation, pregnancy, and live births rates, along with a substantially higher rate of miscarriage compared to women of healthy BMI.

A large European study that investigated women undergoing egg donation treatment found that being obese reduces the embryo implantation rate, which can compromise the rate of conception. The study authors concluded that high body fat reduces uterine receptivity during embryo implantation, which means the implantation is less likely to be successful.

As a result, they advised that a healthy weight is crucial for anyone trying to get pregnant, whether through natural or third-party reproduction.

Lower Response to Medication used to Regulate Ovulation

Being overweight or obese can reduce your body’s response to fertility treatment. A higher weight has been shown to decrease your response to the medication used to induce ovulation, which is a big problem for a surrogate. Obese women undergoing IVF often require higher doses of gonadotrophins (FSH), respond poorly to ovarian stimulation, and have fewer eggs (oocytes) harvested.

Though dosing changes could improve chances for a successful pregnancy, high BMI is also associated with poor-quality embryos and a lower rate of fertilization.

Greater Need for Carefully Measured Dosing

The rate at which the body clears drugs increases with body size, which means people with higher body mass have different dosing requirements. It can be challenging to calculate the proper dosage of fertility drugs because most drug dosages are based on data from women of average weight.

Having a higher BMI can also place more strain on your liver and kidneys, so they may not function as efficiently when processing and eliminating fertility drugs. This pushes your risk of medical issues up even higher.

Multiple Pregnancies

Multiple pregnancies are much more likely with IVF procedures due to the number of embryos implanted. In women of healthy BMI, the risk of complications carrying twins or triplets is already increased above that of a singleton, but this risk is even greater if the woman has a high BMI.

An Enjoyable Surrogacy Experience

You can see why a healthy BMI is so crucial for a healthy pregnancy! Carrying a baby is quite a task for a woman’s body, and a growing fetus needs you to be in the best health possible.

At Family Source, we want all of our surrogates to enjoy their surrogacy from preconception right through to birth and beyond. A healthy BMI means you’re much more likely to sail through your pregnancy and simply look forward to creating a little life!

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Staci Swiderski, CEO and owner of Family Source Consultants, has been a prominent leader in reproductive medicine for over two decades. Through her strategic vision and dedication, she has developed Family Source Consultants into a globally recognized agency specializing in comprehensive egg donation and gestational surrogacy services. Under Staci’s leadership, the agency has become a trusted partner for intended parents, surrogates, and egg donors worldwide, known for its rigorous standards, compassionate support, and commitment to excellence in third-party reproduction.

Her professional insight is uniquely informed by her own family-building experiences. As an intended parent, Staci welcomed her son via gestational surrogacy in 2005, and as a known egg donor, she assisted an infertile couple in expanding their family. These experiences lend a rare depth to her leadership and have fueled her ongoing dedication to ethical, empathetic, and professional support within the field of reproductive medicine.