From The Globe and Mail
While this research is still new, brain-scanning studies by Ed Chambers, a colleague of Dr. Jeukendrup’s in Birmingham, suggest that previously undiscovered carbohydrate sensors in the mouth send signals directly to the brain announcing the impending arrival of more fuel. (The sensors work even if the subjects can’t taste the drink.) The brain then signals that you can go faster, even if the carbs never reach your muscles. At the other end of the spectrum, your muscles really do need more carbohydrate during exercise lasting longer than two hours.
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