Certainly, some blood flow gets diverted to the gut to absorb energy, and isn't available to deliver oxygen and energy to muscles during a workout.
Whether this is an issue will depend on how big a meal it was, and how intensely you are working out.
Endurance athletes (eg. marathoners, long distance bike riders) often eat DURING their workout, to ensure they have enough energy to complete a multi-hour workout. But they tend to snack frequently and lightly.
After a large meal, it may be fine to do something moderate (eg. walking), but you may want to wait a couple of hours before doing a more intense workout.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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