Despite viral TikTok videos claiming that eating McDonald's fries after an embryo transfer can boost the chances of pregnancy, medical experts say there is no evidence to support this trend. Around 52,500 women undergo in vitro fertilisation (IVF) each year in the UK, with an average success rate of 31%, according to the source article. In this context, many couples are eager to try anything that might improve their odds, but a portion of fries is unlikely to make a difference.
Why the McDonald's fries myth persists
The trend, popularised on TikTok, shows women sitting in their cars after an embryo transfer, eating chips with their partners in the hope that it will help the embryo 'stick'. Some creators claim the salt content helps the embryo attach to the womb lining, while others say it makes the lining thicker for implantation. However, Dr Radha Venkatakrishnan, consultant gynaecologist and specialist in reproductive medicine and surgery at CREATE Fertility, told Metro: 'There is no evidence that eating McDonald's fries after an embryo transfer improves implantation or helps an embryo stick.'
Dr Radha explained that an embryo does not attach because of the salt in a particular meal, and eating fries after the transfer cannot suddenly thicken the womb lining. 'The lining has already developed in response to the patient's natural hormones or fertility medication before the transfer takes place,' she said.
The origin of the salty snack advice
The myth likely stems from the early days of IVF when fresh transfers were more common, leading to a higher risk of ovarian hyperstimulation syndrome (OHSS). This condition occurs when the body overreacts to fertility medications used to stimulate egg growth, causing the ovaries to swell and fluid to leak into the belly. Although OHSS often resolves on its own, eating salty foods after egg retrieval was sometimes recommended to help avoid it, as sodium may help draw excess fluid back into the blood vessels.
Dr Radha clarified: 'Advice relating to salt and hydration has sometimes been discussed in the context of ovarian hyperstimulation syndrome, but that is very different from improving implantation.' She added that anyone experiencing bloating, pain, vomiting, breathlessness, or rapid weight gain after egg collection should contact their clinic rather than attempting to manage symptoms with salty food.
Experts urge balanced diet over social media trends
Pharmacist Thorrun Govind advised that a balanced, healthy diet is more beneficial during IVF than increasing salt intake. 'A balanced, healthy diet is important before and during IVF, rather than deliberately increasing your intake of salt and sat,' she told Metro. 'I urge people to seek advice from healthcare professionals who can provide evidence-based guidance, rather than relying on social media trends.'
Despite the lack of scientific backing, the trend has fostered a sense of community among IVF patients on TikTok. Many who shared videos of eating chips after fertility treatment have received supportive comments, and friends and family now send videos enjoying a portion in solidarity. Dr Radha noted: 'If fries have become part of someone's IVF ritual, they can enjoy them without feeling guilty. They should simply be seen as comfort food, not fertility treatment.'
In essence, feel free to enjoy the drive-thru, but don't pin your hopes on it. The trend may bring joy, but it is not a substitute for medical advice.
