You finish dinner, eat nothing overnight, and check your glucose first thing in the morning—only to find that it is higher than expected. It can seem contradictory. If no food went in, where did the extra glucose come from? The key is that food is not the only source of glucose in your bloodstream. Your liver continuously helps maintain blood glucose between meals and while you sleep. In the hours before waking, hormonal changes can also signal the body to make more energy av