Yes, the maximum rate of energy production (in kcal/hr) when using carbohydrates exclusively is approximately twice that when using fat exclusively. However, the energy density of fat is over twice that of carbohydrate (9 vs. 4 cal/g) and you carry a lot more fat stores than carbohydrate stores.
People who want to lose weight or gain muscles we need to understand the BIOENERGETIC SYSTEMS.
Research paper 📑:- http://surl.li/cugtg
FIT BY ME 
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