Originally Posted by Ben Fury
Glycogen is overrated. Get keto-adapted and burn ketones like an Inuit. The Inuit regularly crossed astonishing distances in the Arctic on an almost zero carb diet. The first two weeks of keto-adaptation aren't fun. But after that, you're cruising.
Your body will rip apart proteins for the few absolutely essential tasks it needs glucose for.
See Westman, et al:
Low-carbohydrate nutrition and metabolism
Unfortunately, not everyone responds well to ketogenic diets..... just like not everyone responds well to high carb.
Highly dependent on the person's ability to adapt which is why it's a good idea for people to experiment and see which works best for them.