GLP-1 Receptor Agonists Topic Guide
Curated clips, articles, and podcast episodes
GLP-1 receptor agonists (GLP-1 RA) have rapidly moved from niche diabetes therapies to some of the most widely discussed—and widely prescribed—drugs for metabolic health. While they are often framed as weight-loss medications, their effects extend far beyond the scale, influencing appetite signaling, insulin dynamics, energy balance, and how the body partitions fuel. For some individuals, these drugs can meaningfully improve metabolic health and reduce disease risk; for others, the tradeoffs may outweigh the benefits. This Topic Guide brings together everything Peter has discussed across podcasts, AMAs, and writing to help you understand how GLP-1 RAs work, what the evidence actually shows, and how to reason clearly about their role—if any—in a sustainable, long-term approach to health.
Fundamentals
In this section, we’ve curated clips that explain what GLP-1 receptor agonists (GLP-1 RA) are, how they work, and how they evolved from diabetes treatments into widely used weight-loss drugs. These medications influence appetite signaling, insulin dynamics, gastric emptying, and energy balance—effects that extend well beyond appetite suppression alone. Understanding these mechanisms is essential for evaluating both their potential benefits and their tradeoffs.
The rapidly evolving landscape of GLP-1 RAs
The mechanism of GLP-1 RAs
Pros & cons of GLP-1 RA weight loss drugs
Semaglutide vs. tirzepatide
Data on retatrutide
The mechanisms behind GLP-1 RAs' ability to promote weight loss
How GLP-1 RAs compare to metformin and SGLT2 inhibitors
How do oral formulations of GLP-1 RA drugs compare to injectable
How compounding pharmacies affect availability of GLP-1 RAs
How do sublingual GLP-1 RA drugs compare to injections
Evaluating rapamycin metformin and GLP-1 RAs
The metabolic effects of GLP-1 RAs
Rethinking protein needs for performance – GLP-1 RA drugs
Semaglutide background, brand names, indications, and more
Tirzepatide background, brand names, indications, and more
Semaglutide and tirzepatide
The Qatar study on GLP-1 RAs
Outcomes
In this section, we’ve curated clips that examine what GLP-1 RAs actually improve—and how those outcomes should be measured. While weight loss is the most visible effect, these drugs can also influence insulin sensitivity, cardiometabolic risk, and other markers of metabolic health. The clips here explore how GLP-1 RAs compare with lifestyle interventions and other medications, where the evidence is strongest, and where important uncertainties remain.
Are there GLP-1 RA benefits beyond improving metabolic health and promoting weight loss
How GLP-1 RAs might boost fertility in women
Can the GLP-1 RA weight loss be sustained indefinitely?
Exploring why GLP-1 RAs may reduce the risk of cancer
Potential neuroprotective benefits of GLP-1 RAs
GLP-1 RA drugs and lifespan
The long-term efficacy of GLP-1 RAs
New data on body weight changes after discontinuing GLP-1 RA drugs
The potential of GLP-1 RAs to play a large role in public health
GLP-1 RA drugs and the brain
Semaglutide vs. lifestyle interventions
Can GLP-1 RAs be beneficial for sleep apnea?
What happens if you stop taking a GLP-1 RA?
Tradeoffs and Risks
In this section, we’ve curated clips that focus on the costs and limitations of GLP-1 RAs. Topics include side effects, long-term safety, metabolic adaptation, and the loss of lean mass that can accompany rapid weight loss. These clips also address what happens when treatment is stopped and why preserving muscle, maintaining adequate protein intake, and resistance training are critical considerations for anyone using these drugs.
Potential health risks of GLP-1 RAs
GLP-1 RAs and thyroid cancer
How GLP-1-RA-induced weight loss affects muscle mass
How do the side effects compare for semaglutide and tirzepatide
Effects of GLP-1 RAs on lean mass and body composition
Examining the potential link between GLP-1 RAs and increased depression
New insights into the long-term safety of GLP-1 RAs
Major remaining GLP-1 RA questions
Overview of the new GLP-1 RA data and open questions
Use Cases
In this section, we’ve curated clips that help translate evidence into decisions. The focus is on who may benefit most from GLP-1 RAs, where caution is warranted, and how these drugs might—or might not—fit into a sustainable, long-term approach to metabolic health. We also explore emerging and off-label use cases, along with the broader ethical, financial, and practical considerations that shape real-world decision-making.
The rapid success of GLP-1 RAs for weight loss
Key considerations when deciding whether to use a GLP-1 RA
How to preserve muscle and bone while using GLP-1 RA medications
Guidance for using compounding pharmacies to purchase GLP-1 RAs
The role of GLP-1 RAs in bodybuilding
The biggest open questions about women’s health and GLP-1 RA use
The use of GLP-1 RAs by athletes as performance enhancers
Early indications that GLP-1 RAs may help treat substance abuse
Can GLP-1 RAs be useful in treating addiction
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Full Podcast Episodes Related to GLP-1 Receptor Agonists
AMA
New insights on GLP-1 agonists (Ozempic, Wegovy, Mounjaro)
AMA
Peter evaluates longevity drugs, aspirin for CVD, and strategies to improve muscle mass — promising, proven, fuzzy, noise, or nonsense?
Guest Episode
Women’s health and performance: how training, nutrition, and hormones interact across life stages
Guest Episode
Rethinking nutrition science: the evolving landscape of obesity treatment, GLP-1 agonists, protein, and the need for higher research standards
Podcast Episode
Insulin resistance masterclass: The full body impact of metabolic dysfunction and prevention, diagnosis, and treatment
Guest Episode
The science of resistance training, building muscle, and anabolic steroid use in bodybuilding
Guest Episode
A new era of longevity science: models of aging, human trials of rapamycin, biological clocks, promising compounds, and lifestyle interventions
Guest Episode
Rethinking protein needs for performance, muscle preservation, and longevity, and the mental and physical benefits of creatine supplementation and sauna use
AMA
Pros and cons of GLP-1 weight loss drugs and metformin as a geroprotective agent
Guest Episode
The protein debate: optimal intake, limitations of the RDA, whether high-protein intake is harmful, and how to think about processed foods
AMA
Metabolic health & pharmacologic interventions: SGLT-2 inhibitors, metformin, GLP-1 agonists, and the impact of statins
AMA
GLP-1 Agonists – The Future of Treating Obesity?
Guest Episode
How metabolic and immune system dysfunction drive the aging process, the role of NAD, promising interventions, aging clocks, and more
Podcast Summary
Peter’s takeaways on aerobic exercise and VO2 max, insulin resistance, rising healthcare costs, treating children with autism and ADHD, and strength training
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Cardiovascular disease in women: prevention, risk factors, lipids, and more
Guest Episode
