Comment by BirAdam

3 days ago

Not quite. The body will just enter ketosis if glucose and glycogen levels are too low.

The grandparent means something a bit different. Muscles can use glucose without _oxygen_ to get short bursts of energy quickly by rearranging glucose molecules (indirectly) into lactic acid.

Ketones can't be used for this purpose.

  • Glycogen is stored in the muscles and in the liver, not just the liver. The liver holds around half of your reserves.