What Your Doctor Isn't Measuring

(Listen on Apple Podcasts | Spotify | YouTube)

You eat well. You move. Maybe you track your cholesterol, your VO2 max, your labs.

But here’s the uncomfortable truth. Almost everything we use to measure health is a proxy. An association. A stand-in for the thing we actually care about.

And the thing we actually care about is simple. Can your body still do the things you love? Will it keep doing them as you age?

That question is what my guest this week has spent his career answering.

Scott Fulton lectures on aging at the University of Delaware and sits on the True Health Initiative Council. In his new book, Function, he builds the framework medicine forgot. Not how to manage disease, but how to measure whether your body can actually do what your life requires of it.

In this episode we explore:

• Why most of what we measure in medicine is a proxy, not a direct answer

• The five domains of functional health, and the blind spot hiding in the one you ignore

• Why fitness can coexist with fragility, but function cannot

• The simple at-home tests that tell you where you really stand

• How Scott’s wife rebuilt her bone density in 16 months

• Why doing a little bit every day beats chasing the optimal program

Whether you’re in midlife and want to stay ahead of this, or you’re a little older and want to know where you really stand, this episode shows you what’s possible and what to do next.

Timestamps

00:00 – Why your health metrics might be lying to you
01:38 – Drowning in hype, starving for truth
04:12 – Proxy vs. direct measure: why the difference matters
07:28 – The problem with the VO2 max obsession
09:52 – The fear underneath every health conversation
11:45 – What an engineering and failure-analysis mind sees that clinicians miss
15:12 – Fitness can coexist with fragility. Function cannot.
18:46 – The word “fragility,” and what it really means
21:23 – The five domains of functional health
23:30 – Blind spots: the domain quietly failing while you optimize the rest
30:52 – The user guide: five domains, three tiers, 44 self-assessments
38:57 – Why the low quartile is your biggest opportunity
44:25 – The house of cards: why one weak link brings it all down
45:33 – How Scott’s wife rebuilt her bone density in 16 months
48:44 – Where to start if you don’t exercise at all
56:30 – Scott’s words to live by: know your health span
59:38 – Making life a feast: try something new, plan to fail

Scott Fulton is a longevity authority and aging educator who came to this work not as a clinician but through engineering, systems research, and failure mode analysis. That background shapes everything about how he thinks. He is the person who walks into a broken system, figures out what to measure, gathers data you can trust, and uses it to fix what’s actually wrong.

He lectures on aging at the University of Delaware, is a member of the American College of Lifestyle Medicine, sits on the True Health Initiative Council, and is past president of the National Aging in Place Council. He is the author of Whealthspan: More Years, More Moments, More Money, which he discussed in a previous episode of The Health Feast.

His new book, Function, lays out a framework for measuring functional health span, the five domains that determine whether you can keep doing the things you love as you age. It’s built around 44 self-assessments you can do at home, drawn from standard tests refined over decades of population data. He is also an Ironman triathlete based in Charlottesville, Virginia.

• Book: Function

• Previous book: Whealthspan: More Years, More Moments, More Money

• YouTube: Whealthspan channel

• LinkedIn: Scott Fulton

If you’re looking for ongoing support — not just inspiration — the RAK ON Tribe is where we practice this work together.

Membership includes:

• Monthly live breathwork with Yang

• Group strength training with Coach Alexander

• Cook-alongs and live events with Dr. Rak

• A growing library of replays, resources, and recipes

• A supportive, encouraging community

Learn more and join the RAK ON Tribe