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What Powers Muscle
It was long thought that the primary, if not exclusive, fuel of muscle metabolism was carbohydrate. Despite this staunchly-held belief, investigations demonstrated that fat could also be used as fuel by muscle.
During the early years of the 20th century, the biochemical pathways by which the body processes food as fuel were being worked out. As it happened, the pathways for carbohydrate use were the first to be uncovered.
The pathways for fat use would not be discovered for several more decades. In fact the whole idea of an interrelationship between carbohydrate and fat use would not be discovered for many years in the future; indeed a thorough understanding of this interrelationship didn‟t occur until about 1980...