So, if I’m deprived of a dietary source of glucose, I depend solely on my liver to release glycogen (a process known as hepatic glucose output, or HGO). How long can HGO supply my brain with sufficient glucose? It depends on a few things that impact both the “source” and the “sink” of glucose. Other competing sinks for glucose (., activity level, thermogenic needs) and sources (., glycerol and gluconeogenic amino acid availability) can make a difference for a while. But, in a state of starvation we’ve only got about one to three days before we’re in trouble. If our brain doesn’t get a hold of something else, besides glucose, we will die quite unceremoniously.
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