I find that if I eat, my stomach gets upset AND I get hungry. If I just start out hungry, the feeling goes away quickly and I have no problem.
Occasionally I will ride 35 miles instead of my usual 11. On those days I do have a small snack first, usually a bagel with cream cheese or some cereal. Then I have to take it easy for the first half hour or so.
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Work: the 8 hours that separates bike rides.