Originally Posted by
Carbonfiberboy
Every high end carb-burning rider on here can ride for 4 hours without eating. That's fat burning. However, and it's a big however, focusing too much on fat burning limits the power available through carb burning. Since carb burning is what you have to do to go fast, most folks focus on carbs and let the fat burning take care of itself.
See posts 50, 56, and 60.
That is still missing the adaptation you get by being in ketosis for some time. Just riding will never make you as adapted as being in ketosis for say a month. I saw some research where they compared two riders amount of carbs and fat burned while riding before and after eating keto. Both became better at riding harder on fat, IE. less carbs were used at low and moderate levels compared to before which leaves more carbs left. You can ride your whole life and you'd never get those benefits.
I'll see if I can dig it up again.