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

Most people think feeling tired, foggy, and “off” is just what happens with age.

But what if the real issue is that your cells are running on less fuel than they used to?

In this episode of the Kwik Brain podcast, I sit down with Dr. Andrew Salzman, Harvard-trained physician, inventor, and biomedical entrepreneur, to unpack what’s happening at the cellular level when energy drops and your brain stops feeling sharp.

We break down NAD, a molecule involved in hundreds of critical reactions in the body, why it declines as you age, and how inflammation can accelerate that decline. We also talk about NMN, and why your brain is often the first place you feel the effects when cellular energy dips.

In this episode, you’ll learn:

☑️ What NAD does for energy, cognition, and resilience

☑️ Why NAD drops so significantly by midlife

☑️ How NMN works as a precursor to support NAD production

☑️ The “bathtub” model: why boosting NAD is not just about adding more, but also slowing the drain

☑️ How inflammation can drive NAD depletion through CD38

☑️ Why better cellular energy can translate into clearer thinking, better memory, and sharper focus

If you’ve been feeling like your brain isn’t firing the way it used to, your energy is unpredictable, or your focus is slipping, this episode will help you understand what’s happening underneath the surface and what you can do to support your brain at the level where performance actually starts: your cells.

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