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Kwik Brain · March 9, 2026 · 00:30:47

Harvard Doctor: The Hidden Reason Behind Low Energy, Aging, and Cognitive Decline (And How to Fix It)

Dr. Andrew Salzman

Jim Kwik sits down with Dr. Andrew Salzman to explore why energy and mental sharpness decline with age, focusing on the molecule NAD. Dr. Salzman explains NAD's crucial role in hundreds of cellular reactions, how its levels drop by midlife, and the inflammatory enzyme CD38 that accelerates that decline. He presents the 'bathtub model' for maintaining NAD levels, balancing production with depletion, and discusses NMN as a precursor supplement. The conversation highlights why the brain is often the first organ to feel the effects of dropping cellular energy, and how optimizing NAD may improve memory, focus, and overall cognitive function.

This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.

Canon

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NAD: The Molecule Powering Your Cells and Brain
NAD is a critical molecule involved in hundreds of cellular reactions, essential for energy production, cognition, and resilience.
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Novel

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The Bathtub Model: Balancing NAD Production and Drain
Dr. Salzman uses a bathtub metaphor to explain that NAD levels depend on both how much you produce (the faucet) and how much you lose (the drain).
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Highlights

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CD38: The Enzyme Linking Inflammation to NAD Loss
The enzyme CD38, activated by inflammation, breaks down NAD and can accelerate age-related decline.
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Why Your Brain Feels the NAD Drop First
The brain is one of the most energy-demanding organs, making it especially sensitive to drops in cellular energy from NAD decline.
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NMN as a Precursor for NAD Production
NMN (nicotinamide mononucleotide) is a direct precursor that the body can use to manufacture NAD.
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