Join Date: May 2007
Location: Santa Cruz Mountains
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Gatorade should help within 20 minutes or half an hour if its low blood sugar. Maybe you're just tired and need a nap.
I was using endurance broadly, as in cycling is an endurance sport. Riding at a low enough intensity will use mostly fat and would prolong the amount of riding until you bonk. How low and how long depends on the person as some people are better at using fat than others. Some pro racers have worked on training themselves to burn more fat.
You have never had any calorie related nutrition problems, not even bonking? Everyone I know (mostly racers) has bonked or run low on food at least a few times. You must be unusually well attuned to the state of your blood sugar and your nutrition.