It's often said on Paleo/Primal sites that fat is the more efficient metabolic fuel. That more ATP per molecule is generate from fat than is produce per molecule of glucose. What I haven't been able to find is the burn rate. How many molecules per time can mitochondria burn of glucose Vs fat? If fat produces (making this up) 10x more ATP when compared to glucose but glucose move 100x faster.... Does anyone have any information on ATP production with the time domain included?
asked bypaleohacks (78467)
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on March 12, 2012
at 07:51 AM
I don't have a number for you, because the efficiency in which fat is burned can change drastically (by diet). Your body gets better at burning the type of fuel you put in. So any studies would most likely be on people eating a standard American diet, and they very likely would not be fat adapted.
You can look at exercise tests of metabolic efficiency to see how much fat vs carbs people are burning at various heart rates. This will be so different in different people but I know that I am able to burn predominantly fat even into very high heart rate zones (high 160s), showing me that it can happen fast enough to be more useful than carbs.