No guest this week, just the two besties going deep. Dr. Junaid Kalia and DR GPT™ Harvey Castro step back to ask what actually changed in healthcare AI this fall, and why it matters. They land on two shifts pulling in the same direction. Junaid’s is technical and under-reported: we have started building AI models for machines, not humans, systems that return a calibrated decision and a probability instead of paragraphs of text, running an entire EHR as a “decision machine” in seconds and at a fraction of the cost. Harvey’s is human and personal: the move from reactive to proactive medicine, built around the one metric he argues beats almost everything else, your VO2 max. One of them lost his father to an emergency that started silently years earlier. The thesis that ties it together: the best emergency is the one that never comes.

• Cold open: what if your emergency has already started? (DR GPT™ Harvey Castro)
• The shift: we are building AI for machines, not humans (Junaid)
• Reactive vs proactive medicine, and why it is personal (DR GPT™ Harvey Castro)
• VO2 max: the longevity metric that beats fixing diabetes (DR GPT™ Harvey Castro)
• Men’s health, and why men die sooner (Junaid)
• Self-evolving research agents and “benchmark as teacher” (Junaid)
• Why SaveLife.AI™ now runs its own GPUs (Junaid)
• Decisions, not language: building AI for outcomes (Junaid)
• Warfarin and the EHR as a decision machine (Junaid)
• 600 questions on one chart, in under a second (Junaid)
• The close: take care of your body today (DR GPT™ Harvey Castro)

🖇️ Calibrated “decision” models: System-1-style systems that return a choice and a probability instead of text (product and company names were spoken on-air; verify spelling before citing)

🖇️ Small, knowledge-light models (e.g., the MiniCPM family) as fast decision engines

🖇️ SaveLife.AI™ bringing its own GPUs online

🖇️ VO2 max and cardiorespiratory fitness as a mortality predictor

🖇️ Daily steps and longevity (the 7,500-step discussion)

🖇️ Signal & Symptoms Ep 54 (Dr. Alan Weiss): genetic testing at scale

Dr. Junaid Kalia, Neurocritical Care Specialist and Founder of SaveLife.AI™ (host)

💼 LinkedIn: https://www.linkedin.com/in/junaidkaliamd

🔗 Website: https://www.junaidkalia.com/

📹 YouTube: https://www.youtube.com/@junaidkaliamd

DR GPT™ Harvey Castro, ER Physician (co-host)

💼 LinkedIn: https://www.linkedin.com/in/harveycastromd/

🔗 Website: https://www.harveycastromd.com/

Visit our website: https://signalandsymptoms.com/

Get advisory insights about Healthcare AI, at zero cost: https://junaidkaliamd.substack.com/

Medical disclaimer: This conversation is for general informational purposes and is not medical advice. Listening does not create a doctor and patient relationship. The longevity and fitness points are general wellness information, not a treatment plan; talk to your own clinician before changing exercise or health routines. Views expressed are the hosts’ own and do not represent their employers. No PHI is shared.

The cost of sequencing your genome just fell below $100, so the hard question is no longer “can we test?” It is “should you know what you cannot fix?” That is the tension at the center of this episode, and the panel refuses to give it an easy answer.

Dr. Alan Weiss, Senior Vice President of Clinical Advancement at Banner Health, returns to Signal & Symptoms (his second appearance) for a conversation on genetic testing at scale, hosted by Dr. Junaid Kalia with co-hosts Dr. Isha Mannering, DR GPT™ Harvey Castro, and Edward Marx. Alan tells the story of a colleague, a genuine health specimen, who did a consumer panel and learned she carries risk for a rare, untreatable cancer, turning her overnight into one of the “worried well.” Harvey shares finding his own macular-degeneration gene during a chess game with his grandfather, and later, how CRISPR let a sickle-cell patient climb a mountain. Junaid raises the Apple Watch AFib problem, where a screening tool floods the system faster than it can absorb. Isha holds the line that genetics is still just a tool, and that newborn screening is where universal testing clearly wins. And Alan closes the loop with a confession: offered widespread testing himself, he said no.

• Cold open: CRISPR, and a gene you cannot unknow
• A gene you can’t unknow
• Welcome back Dr. Alan Weiss: genetics, genomics, and AI
• A grandfather, chess, and a risk gene (DR GPT™ Harvey Castro)
• The cost just fell below $100 02:08 The “worried well”: a healthy colleague, a frightening result
• Information vs wisdom: knowing what NOT to do
• Pharmacogenomics: the codeine metabolizer example
• Offer it, or patients get it elsewhere (Edward Marx)
• The Apple Watch AFib problem
• Genetics is still just a tool (Dr. Isha Mannering)
• Does knowing your risk change behavior? The back-pain paradox
• CISPR let a sickle-cell patient climb a mountain (DR GPT™ Harvey Castro)
• Newborn screening: where testing clearly wins
• “I was offered testing, and I said no”

🖇️ The sub-$100 genome and the falling cost curve of sequencing

🖇️ Pharmacogenomics: the fast-metabolizer / codeine safety example

🖇️ The Apple Watch AFib screening surge and screening-to-diagnostic capacity

🖇️ CRISPR and sickle cell disease

🖇️ State-mandated newborn screening and the move toward genomic newborn screening

🖇️ Signal & Symptoms Ep 52 (Dr. Alan Weiss, first appearance): the empathy debate

Dr. Junaid Kalia, Neurocritical Care Specialist and Founder of SaveLife.AI™ (host)

💼 LinkedIn: https://www.linkedin.com/in/junaidkaliamd

🔗 Website: https://www.junaidkalia.com/

📹 YouTube: https://www.youtube.com/@junaidkaliamd

Dr. Isha Mannering (co-host)

💼 LinkedIn: https://www.linkedin.com/in/isha-mannering

DR GPT™ Harvey Castro, ER Physician (co-host)

💼 LinkedIn: https://www.linkedin.com/in/harveycastromd/

Edward Marx, CEO, Advisor (co-host)

💼 LinkedIn: https://www.linkedin.com/in/edwardmarx/ 🔗 Website: https://www.marxadvisory.com/

Special Guest:

Dr. Alan M. Weiss, MD, MBA, FACP, Senior Vice President of Clinical Advancement, Banner Health (physician-informaticist; former CMIO)

💼 LinkedIn: https://www.linkedin.com/in/dralanmweiss/

Visit our website: https://signalandsymptoms.com/

Get advisory insights about Healthcare AI, at zero cost: https://junaidkaliamd.substack.com/

Medical disclaimer: This conversation is for general informational purposes and is not medical advice. Listening does not create a doctor and patient relationship. Views expressed by the guest and co-hosts are their own and do not represent their employers. Genetic and screening decisions should be made with a qualified clinician and, where appropriate, a genetic counselor. No specific company or test is endorsed. No PHI is shared.