Glucose is a scarce and dirty-burning fuel; it was never meant to be the predominant human fuel source.
The Author of this Quote
![Mark Sisson](/_next/image?url=https%3A%2F%2Fassets.heroic.us%2Fauthors%2Fheadshots%2Fmark-sisson.jpg&w=640&q=75)
Author
Mark Sisson
American fitness author and blogger, and a former distance runner, triathlete and Ironman competitor
Glucose is a scarce and dirty-burning fuel; it was never meant to be the predominant human fuel source.