[big bad easter bunny]

The main supplier of glucose into the blood is the liver - either directly from its own glucose store (as glycogen, like muscle) or because it can turn fat and protein into glucose (called 'gluconeogenesis' - the new formation of glucose).

[Rytwyng]

The main supplier of glucose into the blood is the liver - either directly from its own glucose store (as glycogen, like muscle) or because it can turn fat and protein into glucose (called 'gluconeogenesis' - the new formation of glucose).

True, but as I noted, the muscles can also burn fats directly.