EP298: Blue Light Glasses and Smells to Remember

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. Podcast Summary Introduction Dr. Warrick Bishop, a cardiologist, author, and CEO of the Healthy Heart Network, hosts this podcast dedicated to helping people understand cardiovascular health and live as well as possible for as long as possible. In this episode, Dr. Bishop reviews recent medical research from Medscape, discussing two emerging health topics: the efficacy of blue light blocking glasses and the cognitive benefits of inhaling pleasant scents during sleep. Key Takeaways: Blue light blocking glasses likely do not reduce eye strain or improve sleep quality, according to a systematic review of 17 clinical trials involving 619 people published in the Cochrane Database of Systematic Reviews. Computer screens and artificial light sources expose people to only about one-thousandth of the blue light received from natural daylight, making the concern about screen-based blue light exposure significantly overstated. Blue light filtering glasses typically block only 10-25% of blue light, which combined with the minimal exposure from screens, provides minimal benefit to users. Simple lifestyle modifications like reducing screen time, taking regular breaks, and avoiding screens several hours before bedtime are more effective strategies for managing eye strain and improving sleep quality. Inhaling pleasant essential oil aromas during sleep showed a remarkable 226% improvement in memory in cognitively normal older adults over six months compared to a control group. The olfactory (smell) nerve provides a direct "superhighway" connection into the brain's memory centers, making smell the only sense with direct access to these critical cognitive areas. A study using rose, orange, eucalyptus, lemon, peppermint, rosemary, and lavender scents delivered nightly via diffuser showed improved brain functioning in the left uncinate fasciculus, a memory-linked brain region that typically declines with age. While the aroma research is promising and preliminary, more studies are needed to confirm and understand the mechanisms behind the cognitive benefits of olfactory enrichment.