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I really like what wayner wrote above.
If you deplete your.blood sugar during your exercise you should have eaten more (sugar) before hand. Hard intervals I eat a clif bar 10 minutes before, very bad if I don't and can't complete the exercise at full intensity. There's no mtb ride that I'd do without fueling with simple carbs first and during on long rides.
If you aren't depleting your blood sugar then there's no problem. If you keep intensity low enough then there is no issue with being 'fasted.'
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