EP433: Sleep Hormones & Bone Health

Welcome to my podcast. I am Doctor Warrick Bishop, and I want to help you to live as well as possible for as long as possible. I’m a practising cardiologist, best-selling author, keynote speaker, and the creator of The Healthy Heart Network. I have over 20 years as a specialist cardiologist and a private practice of over 10,000 patients. Dr. Warrick Bishop, a cardiologist, author, and CEO of the Healthy Heart Network, hosts this solo episode focused on two key health topics: the effectiveness of sleep sounds and the role of hormone replacement therapy (HRT) in bone health. Drawing on recent research, he breaks down practical findings aimed at helping listeners live healthier, longer lives. Key Takeaways: White noise disrupts sleep by reducing deep sleep and shifting people toward lighter, less restorative sleep stages. Pink noise, often used in sleep apps, was found to reduce REM sleep and provided no measurable benefit for deep sleep quality. Combining pink noise with additional environmental noise made sleep quality even worse, reducing both deep and REM sleep. Earplugs were shown to restore normal sleep patterns, suggesting that silence is more beneficial than any background noise for quality rest. A large study of nearly 140,000 women found that early HRT led to better bone health outcomes compared to no HRT, with clear benefits emerging by the five-year mark. No significant difference in bone health outcomes was observed at three years, highlighting that bone loss and protection are slow, gradual processes. Estrogen plays a protective role in bone density, and postmenopausal estrogen decline is a key driver of osteoporosis risk in women. Early initiation of HRT is more effective than starting later, as waiting until bone loss is advanced makes it harder to reverse. HRT benefits are not universal and should be individually assessed in consultation with a general practitioner, not self-administered.