Why is losing weight—and keeping it off—so difficult? A leading neuroscientist explains the biology of hunger, the rise of GLP-1 medications, and what science is revealing about the brain's role in body weight regulation.

In this episode of The LIVING Room Podcast, Chris Wharton sits down with Dr. Zachary A. Knight, PhD — Professor of Physiology at UC San Francisco, Howard Hughes Medical Institute Investigator, and one of the world's leading researchers studying the neural circuits that regulate hunger, thirst, and body weight.

Drawing from decades of research, Dr. Knight explains why body weight is influenced by far more than motivation alone, how genetics and environment interact to shape appetite, what happens in the brain when we lose weight, and why GLP-1 medications have transformed obesity treatment.

Watch this episode to learn:

• Why maintaining weight loss is so challenging for many people
• How genetics and environment work together to influence body weight
• What happens in the brain when you're hungry—and when you're full
• How GLP-1 medications like Ozempic, Wegovy, and Mounjaro affect appetite and food-related reward signals
• The science behind "food noise" and why many patients report it decreases on GLP-1s
• Whether weight-loss medications are likely to be lifelong treatments
• Practical, science-backed ways to increase satiety and better manage hunger
• What researchers are learning about hydration, thirst, and the body's internal regulation systems
• Where the next generation of obesity and metabolic health treatments may be headed

This isn't diet advice. This is the neuroscience of hunger — and it will completely change how you think about your body.

Connect with Dr. Zachary A. Knight:

https://knightlab.ucsf.edu/

http://www.linkedin.com/in/zachary-knight-29a37977

https://x.com/zaknight

Want more? Each month, we send a newsletter curated by our scientific council on what's actually advancing the science of human longevity — and what isn't. Subscribe at https://www.thewndrlab.com/mailing-list.

The WNDR Lab: TheWNDRLab.com

Most anti-aging skincare is focused on the surface — but the real story of skin aging starts much deeper. Mayo Clinic dermatologist Dr. Saranya Wyles breaks down what’s actually happening beneath your skin, why up to 75% of skin aging may be modifiable, and what science really says about retinol, SPF, red light therapy, collagen, peptides, GLP-1s, and more.

Saranya Wyles, MD, PhD, is the Director of the Regenerative Dermatology and the Skin Longevity Laboratory at Mayo Clinic whose work focuses on skin aging, wound healing, cellular senescence, and regenerative medicine. In this episode of The LIVING Room Podcast, she joins Chris Wharton to explain why your skin is often a reflection of what’s happening inside your body — from brain health to heart health and overall aging, what SPF, retinol, red light therapy, collagen, and peptides actually do, and why the future of skincare will include 3D-bioprinted skin tissue and regenerative therapies.

What we cover in this conversation:

• Why 75% of skin aging is modifiable — and what that actually means
• The skincare routine a Mayo Clinic dermatologist actually recommends
• Why oral collagen supplements may be a waste of money
• Whether retinol, red light therapy, and peptides live up to the hype
• What sunscreen actually protects you from (and how it impacts vitamin D)
• Why weight-loss drugs like GLP-1s may be aging your face
• The future of regenerative skin repair — from exosomes to 3D-bioprinted skin

For science-backed clarity on what really protects your skin, free from the noise of anti-aging marketing — this episode delivers true value around powerful anti-aging practices that you can apply to your life.

Learn more about Dr. Saranya Wyles https://www.instagram.com/drwyles.derm

What does it really look like to evolve into the best version of yourself? Robert Downey Jr. sits down with Chris Wharton for an honest conversation about discipline, self-awareness, taking control of one’s health, and what happiness truly means after living one of Hollywood’s most extraordinary lives.

In this episode, Robert Downey Jr. opens up about the daily rituals that keep him grounded, why he was the very first "patient zero" for Chris's wellness program, and what he learned from years of burning the candle at both ends. From preparing for Broadway to suiting up for Marvel, this is a masterclass in intentional living from a man who's seen it all.

Connect with Robert Downey Jr. at https://www.instagram.com/robertdowneyjr

Want more? Each month, we send a newsletter curated by our scientific council on what's actually advancing the science of human longevity — and what isn't. Subscribe at https://www.thewndrlab.com/mailing-list.

The WNDR Lab: https://www.thewndrlab.com/