I don't know. I don't run marathons. And doubt that the great majority of humankind ever has or will push their bodies to such unnatural extremes. My aim is good health, not world-class sports performance.
But I will tell you this. Before embarking on a high-fat/low carb diet. I was 10-15 lbs overweight and took blood pressure medication. I also had to avoid salt. My endurance on hot days was nil. I couldn't mow the lawn in summer without wilting.
Now, my weight dropped 15 lbs. My blood pressure dropped back to 115/70. I stopped the medication. My fasting blood sugar dropped into the 80s. No more mid-morning dizzy spells. No more energy highs and lows. And I take extra salt every day in the form of bouillon drinks. Now I can endure the heat without fading.
So the low-carb business is working for me. And, once again, my aim is a good healthy life without the burden of the widespread metabolic diseases that afflict so much of our population. If I were endeavoring to become an extreme athlete of some sort, then I may need to rethink my nutritional requirements. But is extreme performance really healthy?
>>But is extreme performance really healthy?
Depends on what the definition of “extreme is.
The post-modern sedentary lifestyle in the context of caloric overabundance is an unnatural and temporary anomaly.
Migrated lately?