Maintaining blood glucose within a narrow range (e.g., 100-200 mg/dL) is crucial for survival, with levels below 50 mg/dL or above 400-500 mg/dL being acutely dangerous.

“if it ever Falls below about 50 milligrams per deiler or half a teaspoon total glucose circulating you're dead if it really ever gets above 4 or 500 acutely like you're dead and that it can keep most of us around 100 to 200 is incredible”