What's the data on the effects of a 20-24 fast after a refeed? Does the fast negate the leptin boost that the refeed is designed to provide? Will your body draw on those now refilled glycogen stores directly afterward, or does it continue to use fat as its primary fuel (assuming fat adaptation)?
asked byJake__2 (671)
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on August 20, 2012
at 08:10 AM
not exactly on the topic of glycogen/fat utilization after a 'feast', but this post may perhaps be of some service: "The 14-percent advantage of eating little and then a lot: Is it real?"
on August 06, 2012
at 06:43 AM
If you're fat adapted, you will continue to use a majority of fat. I don't have the study at hand, but a study appeared to show that once you're fat adapted, your body will prefer to use the fat.
A 4 day fast was conducted with obese and lean people after a meal, and the lean, fat adapted folks continued to burn more than twice the amount of fat.
My take on it is that regardless of refeed carbohydrate intake (assuming their from quality sources) your body will burn fat as a preferred source.
on December 29, 2012
at 02:30 AM
i question the whole leptin boost bit, but once the post-prandial insulin spike passes, you'll burn whatever fuel is appropriate for the activity you're doing (i.e. running, walking, sitting - is it glycolytic work?). liver glycogen will deplete in this case, in order to fuel your brain, but muscle glycogen won't... unless you do glycolytic work.