Dr. Steve Phinney – 'Ketogenic Diets & Endurance Performance Still Controversial After Four Decades'

Dr. Steve Phinney is a physician-scientist who has spent 35 years studying diet, exercise, fatty acids, and inflammation. He has published over 70 papers and several patents. He received his MD from Stanford University, his PhD in Nutritional Biochemistry from MIT, and post-doctoral training at the University of Vermont and Harvard.

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20 thoughts on “Dr. Steve Phinney – 'Ketogenic Diets & Endurance Performance Still Controversial After Four Decades'

  1. Hello. I have I question which answer I haven’t found in any biochemestry book or study:

    As the main source of glycogen replenishment in a low-carb diet is the liver reprocessing of lactate into glycogen, is the dietary lactate found in fermented foods (yogurt, kumis, kefir) processed the same way in that context of a low carb diet? Or how is it processed? Could it be used as a correct on-race replenishment strategy?

  2. If this was Minecraft he would be saying, “While coal is the optimal source of energy for the furnace; bamboo is better because you can make the furnace fully automatic.”

  3. is the graph from 32:00 not simply saying highlighting the inability for fats to be oxidised anaerobically so the oxygen consumption in the Keto-adapted athletes is higher?

  4. how is it controversial?
    The only people to find any favourable results with a ketogenic diet are Volek and Phinney.
    When anyone else does a study, they find negative effects on performance.

    Seems pretty straightforward to me.
    It's rubbish for any athletic endeavours, until someone throws the name phinney, Volek or Bitter into the argument.
    I'd prefer the millions of other athletes and researchers who eat a LOT of carbs, and WIN the races.
    No prizes for who can go the longest at moderate intensity

  5. Last summer I had been on the keto diet for 6 months with 25g carbs a day. I'm not an ultra endurance athlete, but a strong recreational cyclist. I decided to see how I would feel after increasing sessions of moderate cycling. The focus was on endurance, which I defined as time on the bike. I increased my sessions by 30 minutes every 3rd ride. My max time on the bike was 3.5 hours. It was amazing how great I felt with no problems of recovery or problems during the rides. This summer I plan a century ride. My strictest rule is to monitor my potassium, sodium and magnesium.

  6. I am by no means a professional athlete, but I do 3-4 significant cardio sessions a week and 2 very intense, 2 hour martial arts training sessions. I have found that trying to fuel on a carb rich diet not only leaves me less mentally motivated for the sessions, but I also inevitably run out of glucose during the 2 hour sessions and recover quite poorly.

    I swapped to a LCHF diet and it took about 2 weeks to get into a proper keto burn state and my energy for the 2 hours session was boundless. I was still tired, but not emptied out and I recovered much quicker. Whenever I fall out of keto now, due to a bad carb day or other indulgence, my training suffers. It is a great "canary on the coal mine" indicator to how I work.

  7. Do you know is there a drawback for anaerobic (high intensity) exercises with ketogenic diet, as only glucose can be use apparently for them?

  8. Brilliant, and just what I needed to hear two months into my Ketogenic Marathon training. Dr Phinney is inspirational.

  9. wait did i miss something, where is the second talk? btw, does anyone know of a study, any, that examines lipoproteins and cholesterol during starvation and/or chronic starvation, if by chance "yes" please link research.

  10. Is improved Cholecystokinin a part of the adaptation? Dr. Boz [Annette Bosworth, MD] has information about that.

  11. He says it takes months to become keto or fat adapted, however all you have to do is fast for 5 days with salt/potassium water and you will become fat adapted after that.

  12. it was incidentally discovered I have a considerable pancreatic calcification, asymptomatic. Now it is noted that chronic calcification in the pancreas occurs during inflammation. And since the Keto diet is anti inflammatory it may well be useful in slowing or ceasing further pancreas calcification. provided your pancreas was still producing enough enzymes to process increased fat, in which case you would need to supplement. This is important since continued calcification in the pancreas will lead to chronic and extremely painful pancreatitis, and after that diabetes, and increased risk of pancreatic cancer. So a keto diet, with some general anti inflammatory such as msm powder could be a strategy for people with pancreatic disease, or pre disease.

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