Fruits and vegetables contain soluble and insoluble fiber in varying proportions. When you eat soluble fiber, it absorbs water to form a gel-like mass, which helps you feel full and provides other health benefits. It prevents a surge in blood sugar after you eat by slowing down the absorption of carbohydrates.
If the blood glucose level falls to dangerous levels (as in very heavy exercise or lack of food for extended periods), the Alpha cells of the pancreas release glucagon, a hormone whose effects on liver cells act to increase blood glucose levels.
Low insulin levels cause the release of glucose while more insulin inhibits glucose production by telling the liver to store glucose as glycogen. 3,5 The importance of insulin for maintaining blood glucose levels is mainly due to this effect on liver storage and release.