Originally Posted by
Chaco
The problem is, that on a long ride, your body is consuming carbs very quickly, and once the glycogen is out of your muscles, you either have to provide a quick replenishment, or you'll bonk. Frankly, if you're cycling 60 to 100 miles and have 50 extra grams of carbs during and immediately after that ride, I don't think it will hurt you.
Good way to put it, and that's what I've been thinking lately about low-carb eating and endurance exercising. Frankly, what we do on a bike is historically unnatural (who suspects that cavemen ran around at a high HR for five hours?), and I didn't think that a paleo-natural diet would fuel the activity well enough.
At lower heart rates and exertion levels, it's fine, but it'll have its limits.