The Science of Metabolic Flexibility, Zone 2, and Reversing Diabetes | A Masterclass

Jul 27, 2026 · 2h 20m · YouTube

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EP · The Proof with Simon Hill · The Science of Metabolic Flexibility, Zone 2, and Reversing Diabetes | A Masterclass2:20:28

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0:08I tested once in the laboratory an 81-year-old gentleman who was world champion, cycling world champion, of the 80 to 85 year old bracket, which believe me, it exists, right?

0:23Which is great to see, right?

0:25So anyways, I was fascinated because his metabolism, his metabolic efficiency during the test that I do was that of someone in their 30s or 40s, healthy and active, right?

0:40It was unbelievable.

0:42I keep that test like a treasure, right?

0:45Because it's an absolute treasure to see those adaptations, right?

0:49So anyways, right away I thought, boy, you've been doing sports all your life, right?

0:56So man, you chose the right lifestyle, right?

0:59And he told me, actually, no, actually, until I was in the early 50s, I was obese.

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