Athletes are eating up to ten times more carbs than they need, according to meta-analyses cited here. The real limiter isn't muscle glycogen but your brain's perception of energy, signaled by just 5 grams of circulating glucose. On a low-carb diet, your body uses ketones and fatty acids instead, letting you perform at peak with less than a third of a banana.
If you care about athletic performance, you need to know the myth of carb loading just got obliterated. In a massive series of meta-analyses, researchers discovered that carbohydrate intake recommendations for athletes are wildly overblown, with many athletes consuming 10 times more carbs than they need for peak performance. Now, this stems from the long-held belief that more carbs equal more muscle glycogen equal better performance. But plot twist: muscle glycogen isn't the bottleneck on performance. So what is? Brain energy. Specifically circulating fuel in your blood that signals to your brain, "Hey, we're safe on energy here, you can push harder." Because the blood only contains about 5 grams of circulating glucose at a given time—that's literally less than a teaspoon of honey—you actually need very little carbohydrate to reach peak performance. And here's the kicker. If you adapt to a low-carb diet, alternative energy substrates in the blood like ketones and fatty acids increase, allowing you to hit peak performance with fewer carbs—less than a third of a banana. So say goodbye to pasta dinner because you can indeed sprint on a steak. But if you want more, check out the deep dive jointly written between me and one of the lead researchers, Dr. Andrew Koutnik, and drop your questions because I'm having Dr. Koutnik on my channel for a discussion and we're going to go deep.
