Timeline for Is commuting 10 km on an empty stomach harmful?
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| Aug 27, 2016 at 12:44 | comment | added | Daniel R Hicks | Your answer misses an important point: The glycogen stored in muscles is for use locally by those muscles, and is generally only enough for a few minutes of activity, if blood sugar is completely cut off. However, the liver stores glycogen and converts it to sugar when blood sugar levels drop. Training in conditions where the blood sugar is "drawn down" (by, eg, exercising before breakfast) will lead the liver to develop more glycogen storage capability and more ability to convert the stored glycogen to sugar. However, it's likely best to not do this every day. | |
| Jan 11, 2016 at 14:17 | comment | added | Emyr | I'm relieved the problems with my contribution are all of the "spherical cows in a vacuum" type :-) | |
| Jan 9, 2016 at 0:02 | comment | added | Rider_X | Your body will also prefer different metabolic pathways (e.g., glycogen and fat) depending on the length of time since you last ingested food, the intensity of the current exercise, and your training history. It's a complex set of trade-offs your body continually makes. Repeatedly, exercising a fasted state encourages your body to prefer fat metabolism pathway over glycogen metabolism if the effort is low enough. | |
| Jan 8, 2016 at 15:46 | comment | added | Michael | Your calculation assumes that only glycogen is used and that all glycogen in the body can be used. Glycogen is limited to the muscle where it’s deposited (though most of that will be in the legs ;) ). Fat can and will be used too. | |
| Jan 7, 2016 at 13:35 | comment | added | Emyr | Note: I'm a programmer with a BSc Computer Science, the information above is mostly from Wikipedia and Google search results; Corrections are welcomed. | |
| Jan 7, 2016 at 13:32 | history | answered | Emyr | CC BY-SA 3.0 |