Hi! I am David Rönnlid, a med student from Uppsala, Sweden.
I am exploring the ins and outs of health and medicine and would love to have you with me on this journey!
From this podcast, you can expect conversations with researchers, clinicians, and other experts in health and medicine. Welcome!
(The content provided on this page is for informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment.)
Jonathan Cedernaes: Circadian Health from Molecular Clocks to Public Policy - David Rönnlid Podcast #14
🌍 How can we align our lives — and our societies — with our body clocks?
Poor sleep and circadian misalignment don’t just make us tired — they impair several aspects of our metabolic health. I sat down with Jonathan Cedernaes, M.D., Ph.D., and explored what we can do about it: from personal daily habits to systemic policy reforms. Sleep quality and quantity isn’t just about recovery — it’s a public health issue.
We dive deep into:
✅ Daily habits that keep your circadian rhythm aligned
✅ Why sleep timing is as important as sleep duration
✅ How late nights and irregular schedules impair metabolism and long-term health
✅ Policy changes that could protect circadian health at a population level — from school start times to shift work regulations
✅ The promise of circadian science for future treatments and prevention strategies
💡 What do you think matters more for our collective health: better personal habits or policy reforms?
#SleepScience #CircadianHealth #Metabolism #PublicHealth
Sleep science group: https://www.facebook.com/groups/495466987134152/
Connect with Jonathan on social media:
X: https://x.com/jcedernaes
IG: https://www.instagram.com/sleepydrcedernaesclocks/
Episode chapters:
00:00:00 Introduction
00:02:05 Sleep as a Driver of Motivation and Healthy Habits
00:04:15 Weekend Catch-Up Sleep: Benefits and Limits
00:07:50 Sleep, Metabolic Health, and Obesity Links
00:10:13 Sleep Disruption and Neurodegenerative Disease
00:12:53 Mechanisms: How Neurodegeneration Impairs Sleep
00:18:30 Supplements, Exam Stress, and Slow-Wave Sleep
00:20:01 The Body's Master Clock in the Brain: The Suprachiasmatic Nucleus
00:23:20 Light, Retina, and the Body’s Internal Timekeeping
00:43:16 Late-Night Eating and Sleep Quality
00:46:00 Heart Rate Variability: What It Really Tells Us
00:52:10 Short Sleepers, Long Sleepers, and Individual Needs
01:05:22 Circadian Misalignment: Jet Lag and Shift Work
01:19:44 Sleep and Mental Health Connection
01:33:11 Diet Timing, Fasting, and Circadian Rhythm
01:43:52 Exercise After Sleep Loss: Helpful or Harmful?
01:56:20 MicroRNAs, Sleep Loss, and Neurodegeneration Risk
02:14:36 AI, Research, and Sleep Science in the Future
02:22:06 Summary of most important takeaways from the conversation
7 Sept 2025
Daniel Elias-López: Heart Disease Prevention Beyond “Good” and “Bad” Cholesterol - David Rönnlid Podcast #13
Most of us think of different types of cholesterol as either “good” or “bad.” But the reality is more complex.
Daniel Elías-López, Endocrinologist, Ph.D (https://www.linkedin.com/in/ACoAAAtMVkMByg_K47jUvzPX9BINng35vADpulc), is a Mexican endocrinologist and researcher whose work spans both clinical care and public health. After years of treating patients with obesity, diabetes, and lipid disorders, he saw a limit to what could be achieved in the clinic alone. That realization led him toward research—with work aimed at generating knowledge that could inform prevention and treatment strategies for millions.
In this episode, we discuss:
- Why LDL is only part of the picture
- How elevated cholesterol can remain asymptomatic for years, and why early measurement is important for timely risk detection
- Practical, evidence-based strategies that can help lower risk for cardiovascular events
Rather than claiming to have all the answers, Dr. Daniel Elías-López shares his insights from clinical experience and research —highlighting what’s known, what’s emerging, and why prevention matters.
You can connect with Dr. Daniel Elías-López on LinkedIn: https://www.linkedin.com/in/danieleliasl/ and listen to his podcast in Spanish: https://open.spotify.com/show/31RDgmiIWXQHyHNjgBxeNe?si=6bdf7f42589f4af6
Episode chapters:
00:00:00 - Why lipoproteins are essential for human health
00:07:14 - Research motivation behind studying cholesterol particles
00:14:53 - How lipoprotein particle size affects heart risk
00:22:00 - The main types of cholesterol in the body
00:29:40 - Understanding non-HDL cholesterol and health impacts
00:36:50 - Genetics and their influence on lipid metabolism
00:44:02 - Strategies to improve current cholesterol guidelines
00:51:41 - How cholesterol knowledge translates to clinical practice
00:58:49 - Fasting versus non-fasting lipid blood testing
01:06:29 - What cholesterol levels really tell about health
01:13:40 - Additional lipid markers for cardiovascular assessment
01:20:55 - Current debates in cholesterol research and policy
01:28:30 - Impact of diet on lipid profile and heart health
01:36:10 - Future directions in lipid research and prevention
01:43:55 - Key takeaways and summary of cholesterol insights
16 Aug 2025
Ray Dorsey: Environmental Toxins and Parkinson’s Disease - David Rönnlid Podcast #12
Parkinson’s disease is now the fastest-growing neurological disorder in the world — and according to Dr. Ray Dorsey, it’s not just about aging or genetics.
Dr. Dorsey argues that environmental toxins — including certain pesticides, industrial chemicals, and air pollutants — are significant, modifiable risk factors for developing Parkinson’s disease. In this podcast episode, we discuss:
🔬 The evidence linking environmental toxins to Parkinson’s disease
💡 What individuals can do today to reduce their exposure to environmental toxins that research has shown are associated with increased risk for developing Parkinson's disease
🏛 The public health policy changes Dr. Dorsey advocates to address the rapid rise of Parkinson’s disease in today’s society.
Dr. Dorsey's book "The Parkinson's Plan": https://www.amazon.com/Parkinsons-Plan-Path-Prevention-Treatment/dp/1541705386
Episode chapters:
00:00:00 Episode highlight reel
00:02:11 Introducing Dr. Ray Dorsey, Parkinson’s Disease Researcher
00:04:43 Evidence Linking Long-Term Exposure to Trichloroethylene to Neurological Decline
00:08:10 Environmental Contributions to Parkinson’s Beyond Genetics
00:12:37 Communicating Risks Without Overstating the Evidence
00:16:47 Historical Use and Persistence of Paraquat in Agriculture
00:19:20 Testing Options for Potential Parkinson’s-Related Risk Factors
00:21:48 Why Parkinson’s Risk Reduction Remains a Global Challenge
00:24:51 Practical Measures to Limit Environmental Neurotoxins
00:30:40 The Role of Policy in Reducing Harm
00:33:05 How Public Awareness Can Drive Change in Exposure
Podcast Authority Score: 18 / 100
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