Eating breakfast before excercise could 'prime' the body to burn carbs
Breakfast before exercise increases post-exercise postprandial glucose disposal, speeding up digestion.
Researchers studies the effects of breakfast-rest, breakfast-exercise and overnight fasted-exercise and measured plasma glucose disposal and appearance rates during after an oral glucose tolerance test.
They found the rate at which the body digested and metabolized food eaten post-workout also increased.
This increase in the use of muscle glycogen may explain why there was more rapid clearance of blood sugar after ‘lunch’ when breakfast had been consumed before exercise.
Eating first thing in the morning before exercise helps burn more carbohydrates while exercising and can even speed up digestion post-workout.
Research: Pre-Exercise Breakfast Ingestion versus Extended Overnight Fasting Increases Postprandial Glucose Flux after Exercise in Healthy Men. Link