How digestion works: what happens to food after you eat it
Glucagon: how your blood sugar stays steady between meals
All night, you eat nothing, and your brain burns sugar the whole time. Yet in the morning, your blood still holds its usual teaspoon. What keeps refilling it while you sleep?
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Two in the morning. You are asleep, but your body does not stop. Your brain alone burns about four grams of sugar every hour, and the rest of your body burns some too. Together, that is about twice all the sugar in your blood, every hour.
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So the teaspoon in your blood should be empty in about half an hour. It never empties. Something keeps putting sugar back.
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