3 ms·

Several studies have shown that endurance is equal w/ fat as the fuel. You do have to spend 4 or so weeks adapting though. Here is a link to a summary, I could

• sekm 12y ago
  Yep - this guy does some great stuff on fat too: http://www.bengreenfieldfitness.com/2013/05/low-carb-triathlon-training/ http://www.bengreenfieldfitness.com/2013/05/low-carb-triathl...
• justsomedood 12y ago
  That's a really interesting article. It is fair to point out (which the article does as well) that the athletes were running at 75% of V02 max, which is lower than when racing in cycling. I ride a lot, and anecdotally I had a cycling teammate that changed his diet to consist of primarily fats for 6 weeks. The first few weeks his body was adjusting and his endurance and power dropped dramatically as you would expect. After 4 weeks, though, he had come back and had a really strong season. The way I understand it is that as intensity increases it becomes more difficult for the body to convert fat for a large source of fuel, and glycogen becomes the largest contributor to energy. I know the feeling of a "bonk", when glycogen depletes, is a really strange one and all fuel is coming from fat at that point and intensity has to drop by quite a bit in order to continue. Our bodies are pretty amazing
  • Florin_Andrei 12y ago
    > bonk There's only one thing that gets you out of it quickly - and that's a shovel full of carbs.