We've known for decades that breastfeeding is associated with a reduced risk of breast cancer. What we've never fully understood is why.

That question is what makes this research so significant.

In this episode of The Science of Motherhood, Dr Renee White sits down with Professor Sherene Loi, Medical Oncologist and Group Leader at the Peter MacCallum Cancer Centre in Melbourne, to discuss a landmark paper published in Nature that identifies the immune mechanism behind that long-observed link. Together they explore how pregnancy and breastfeeding appear to reprogram the breast's immune environment in ways that can persist for years, and what that could mean for the future of breast cancer prevention.

It turns out the body's been doing something extraordinary all along. Science is only now catching up to explain it.

You'll hear about:

Why breastfeeding appears to reprogram a mother's immune system
How T cells in breast tissue connect to long-term cancer protection
What "anything is better than nothing" actually means for breastfeeding duration
Why women's reproductive history has been missing from major cancer datasets
How this research could shape future prevention strategies for all women

This research doesn't add pressure to the breastfeeding conversation. It adds meaning to it.

If this episode resonated, share it with someone who'd want to understand the science behind their own body. And subscribe so you never miss an episode of The Science of Motherhood.

Resources & Links

📲 Connect with Renee on Instagram: @fillyourcup_

🌐 Learn more about Dr Renee White and explore Fill Your Cup Doula services

🍪 Treat yourself with our Chocolate + Goji lactation cookies

🔗 Learn more about Professor Sherene Loi and her lab here

This episode is proudly supported by Fill Your Cup, Australia's first doula village, with doulas available across Melbourne, Geelong, Sydney, Newcastle, Brisbane, Gold Coast, Hobart and Perth.

Disclaimer: The information on this podcast presented by Fill Your Cup is not a substitute for independent professional advice. Nothing contained in this episode is intended to be used as medical advice and it is not intended to be used to diagnose, treat, cure or prevent any disease, nor should it be used for therapeutic purposes or as a substitute for your own health professional's advice.

Ep 219. Why Does Breastfeeding Protect Against Breast Cancer?