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Summary
On episode 313 of 40+ Fitness, Coach Allan sits down with Dr. Lee Know, a naturopathic doctor in Canada and author of Mitochondria and the Future of Medicine, who has spent years digging into how mitochondrial function drives energy production, aging, and disease.
Dr. Know explains that mitochondria produce more than 90 percent of the energy our cells use, and that the mitochondrial theory of aging, not the free radical theory that came before it, is now the best supported explanation for why we age the way we do.
The conversation moves through why diet choices like ketosis and calorie restriction change mitochondrial health, and which supplements (D-ribose, coenzyme Q10, L-carnitine, magnesium, creatine, and the B vitamins) actually support the energy making process at the cellular level.
Links
- https://leeknow.com
Key Takeaways
- Mitochondria produce over 90 percent of the energy our cells use. Every chemical reaction and every bit of transport happening inside a cell runs on the ATP mitochondria generate, so when mitochondrial function breaks down, everything downstream starts to fail.
- The mitochondrial theory of aging is now the best supported theory we have. It has replaced the free radical theory of aging, which itself replaced the older wear and tear theory, reflecting a rapid shift in the research over the last decade.
- Ketosis can give the brain an alternative fuel source when it can’t use glucose. In a state sometimes called type 3 diabetes, brain cells stop responding to available blood glucose; ketone bodies can wake those cells back up, which is part of why ketogenic diets are drawing research interest for Alzheimer’s.
- Calorie restriction is the only intervention proven to extend maximum lifespan across every species studied. Fewer calories means fewer electrons flowing through the mitochondria’s electron transport chain, which means less free radical damage to mitochondrial DNA, but it has to stop short of malnutrition to work.
- D-ribose becomes especially important during ketosis or extended fasting. The body makes its own D-ribose from glucose, but very slowly, and with carbs restricted there isn’t enough glucose left over to build it, so supplementing fills that gap.
- Coenzyme Q10 is the bottleneck in the electron transport chain. It receives electrons from two different complexes on their way to being converted into usable energy, so the goal isn’t just meeting the minimum, it’s keeping an excess supply on hand.
- L-carnitine is what lets the body actually burn most dietary fat. It transports long-chain fatty acids, which make up nearly all the fat in a typical Western diet, across the mitochondrial membrane; without it, those fats simply can’t be used for fuel.
- Magnesium stabilizes ATP and is required for muscle relaxation. It holds the third phosphate on the ATP molecule in place until the body needs that energy, and it also drives the enzyme that pumps calcium out of muscle cells, which is why supplementing it often improves sleep too.
- Creatine is a fast, local phosphate reserve, not just a bodybuilding supplement. It rapidly replenishes ATP right where energy is being used, which is why its benefits extend well beyond the gym into muscle, heart, and brain health.
“It appears that the mitochondrial theory of aging is the most evidence-based and supported theory of aging that we know of.”
Dr. Lee Know
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