Forget mitochondria. The real driver of aging may be something most physicians never look at: the capillaries. Kenneth Ro, a double board-certified emergency and internal medicine physician, argues that microvascular decline sits upstream of nearly every aging process we treat, from heart failure to diabetic neuropathy to sepsis. He explains why GLP-1s and SGLT2 inhibitors keep surprising us, why exercise works, and the line that reframes the whole field: you cannot stent a capillary.

⏱️ Chapters:
0:00 Introduction
0:21 The longevity field is missing the forest for the trees
2:10 Why aging is not just deterioration
3:49 The line every physician should remember
4:00 Where microvascular disease is already hiding in your patients
4:53 Four minutes to brain death and what that tells us
5:54 What GLP-1 trials accidentally proved about capillaries
8:18 Sepsis is leaky capillaries
9:36 Use it or lose it, at the capillary level
10:46 The morning routine that opens your capillaries
13:28 Why VO2 max is the longevity number that matters
15:48 The pre-diabetes pet peeve
16:23 Take home messages

About this episode:
Kenneth Ro returns to the show to make the case that microvascular health is the unifying theme of aging, longevity, and chronic disease, and that the longevity field has gotten distracted by mitochondria and cellular pathways while ignoring the substrate problem upstream of all of it. Ro draws on his vantage point as both an ER physician and an internist, where he sees microvascular disease showing up in diabetic neuropathy and retinopathy, in heart failure with preserved ejection fraction, in the no-reflow phenomenon after catheterization, and in sepsis, which he reframes as a leaky-capillary problem. He walks through the recent Nature paper on GLP-1 effects at the pericyte level, explains why exercise improves nearly every health outcome through the same microcirculatory mechanism, and gives practical advice on blood flow restriction training, nitric oxide, beets, arginine, and the role of medications like Cialis in BPH patients. He also shares his pet peeve about pre-diabetes management, arguing that "let's do lifestyle first" misses the window where intervention matters most. Throughout, he returns to one principle: capillary rarefaction is a use-it-or-lose-it system, and the body will close down circulation to anything you stop using. He closes with a simple prescription: a 15-minute walk, a phone put down, and movement hardwired into the start of every day.

Tune into our episode "2026 Cholesterol Guidelines: LDL goals, lipoprotein(a), and coronary calcium scoring," brought to you by Novartis Pharmaceuticals Corporation.

For the first time in eight years, LDL cholesterol goals have changed, and preventive cardiologist Seth Baum says the new guidelines are a long-overdue course correction. He breaks down the new LDL targets for your highest-risk patients, why the LDL hypothesis should be retired in favor of the LDL fact, why lipoprotein(a) screening finally belongs in every patient's workup, what a coronary calcium score over 300 really means for how aggressively you treat, and how to talk to statin-skeptical patients without losing their trust. Listen now at KevinMD.com/cholesterol.

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