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In this episode, Peter takes a deep dive into colorectal cancer (CRC) screening, explaining why it is one of the most preventable cancers and why getting screening right can have life-saving implications. He walks through how colorectal cancer develops and why it is uniquely well-suited to early detection and prevention, with a particular emphasis on the dual role of colonoscopy as both a diagnostic and therapeutic tool. Peter also examines the concerning rise in early-onset CRC among younger adults, highlighting why awareness and timely screening matter more than ever. The episode provides a practical guide to preparing for and evaluating the quality of a colonoscopy, including how to think about appropriate screening intervals and the real risks and tradeoffs involved. Finally, Peter explores the expanding landscape of non-invasive screening options, offering clear insight into what these alternatives can and cannot do so listeners can make informed decisions about their care at any age.

We discuss:

• CRC statistics and goals for this episode [1:00];
• Colorectal cancer development: polyp progression, risk types, and the window for prevention [4:00];
• Why colorectal cancer is uniquely screenable: direct visualization and the dual role of colonoscopy [6:30];
• Colonoscopy effectiveness: prevention through polyp removal and interpreting the NordICC trial data [8:15];
• Rising colorectal cancer in younger adults: trends, possible causes, and the case for earlier screening [12:15];
• Colonoscopy preparation: why bowel prep matters and how newer options improve the experience [16:45];
• Colonoscopy quality, polyp miss rates, and personalized screening intervals [20:00];
• Colonoscopy risks versus colorectal cancer risk: understanding the true risk-benefit tradeoff [29:30];
• Non-invasive screening options for CRC: benefits, limitations, and their role alongside colonoscopy [37:00];
• Colorectal cancer prevention principles: why screening matters and the role of colonoscopy [39:30]; and
• More.

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In this "Ask Me Anything" (AMA) episode, Peter answers listener questions across a wide range of topics, focusing on how to think through real-world trade-offs and apply scientific evidence in practice. He explores how to build and interpret a meaningful family health history, how individual risk tolerance influences decisions around testing and treatment, and why heart disease remains poorly prevented despite available tools. He also examines whether it's possible to carry excess body fat while remaining metabolically healthy, outlines the minimum effective dose for strength training for those with limited time, and discusses the habits and interventions most likely to reduce dementia risk. Additional topics include what evidence would need to emerge for him to reconsider his current stance on NAD-boosting supplements, and when hydration and electrolyte strategies are truly beneficial versus unnecessary.

If you're not a subscriber and are listening on a podcast player, you'll only be able to hear a preview of the AMA. If you're a subscriber, you can now listen to this full episode on your private RSS feed or our website at the AMA #84 show notes page. If you are not a subscriber, you can learn more about the subscriber benefits here.

We discuss:

• Topics overview [1:15];
• Using family history to assess disease risk: why it matters more than genetic testing and how to analyze it effectively [2:30];
• Peter's views that differ from conventional medicine: approaches to cardiovascular risk, cancer screening, nutrition, and more [10:30];
• Risk tolerance in health decisions: weighing action versus inaction and avoiding low-benefit, high-risk interventions [16:00];
• Why cardiovascular disease persists: delayed treatment, insufficient thresholds, and missed opportunities for early intervention [22:00];
• Whether someone can be overweight yet metabolically healthy, and how fat distribution influences metabolic risk [26:45];
• Strength training with limited time: how to maximize results with intensity and efficiency [30:00];
• Designing a sustainable exercise routine: balancing volume, recovery, and enjoyment over time [34:45];
• Reducing dementia risk: prioritizing exercise, sleep, and cardiometabolic health based on individual gaps [38:00];
• Peter's current skepticism toward NAD-related supplements and what evidence would be needed to change his view [40:45];
• Hydration and electrolytes: factors that impact needs and when supplementation might be necessary [43:30]; and
• More.

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In this episode, Peter explores one of the most foundational topics underlying nearly everything discussed on the podcast: how to think scientifically. Framed as an introspective deep dive, he examines why scientific thinking is inherently difficult for humans, the cognitive biases and tendencies that make it challenging to separate belief from evidence, and why these challenges are even more consequential in today's environment saturated with misinformation. He also offers a framework for improving our ability to evaluate claims, question assumptions, and identify a personal panel of experts, providing listeners with practical tools to become more disciplined and effective thinkers.

We discuss:

• Topics to be covered and goals for this episode [2:00];
• Scientific thinking: hypotheses, uncertainty, and the process of ruling out explanations [3:45];
• How scientific knowledge differs from mathematical proof: useful approximations, evolving evidence, and acting under uncertainty [8:00];
• Why scientific thinking is difficult: evolution, social instincts, and the need for deliberate practice [13:30];
• Systems and tools designed to correct human bias [18:15];
• How to think scientifically pt. 1: Notice when you're feeling certain [20:30];
• How to think scientifically pt. 2: Judge the process, not just the conclusion [23:00];
• How to think scientifically pt. 3: Notice when identity is shaping your beliefs [28:15];
• How to think scientifically pt. 4: Don't confuse criticism with understanding [33:45];
• How to think scientifically pt. 5: Outsource your thinking carefully [36:15];
• Evaluating who to trust: incentives, consensus, and red flags in scientific credibility [45:15];
• Science as a self-correcting system: why updating with evidence is a strength, not a weakness [49:00];
• The key principles of scientific thinking, and a practical framework for evaluating claims and improving judgment [50:45]; and
• More.

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