065 What Your Doctor Isn't Measuring

You’re doing everything right. But how do you actually know any of it is working?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 answerThe five domains of functional health, and the blind spot hiding in the one you ignoreWhy fitness can coexist with fragility, but function cannotThe simple at-home tests that tell you where you really standHow Scott’s wife rebuilt her bone density in 16 monthsWhy doing a little bit every day beats chasing the optimal programWhether 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.Timestamps00:00 – 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 56:30 – Scott’s words to live by 59:38 – Making life a feast: try something new, plan to failAbout Scott FultonScott 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 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. 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.—Disclaimer: This is for informational and educational purposes only. It is not medical advice and does not replace a conversation with your own physician or healthcare provider. Always consult a qualified professional before making changes to your health routine.