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.
Glucagon. (Pancreas) Causes the release of free fatty acids into the blood stream. Fast-acting hormone that stimulates an almost instantaneous release of glucose from the liver and is part of a negative feedback loop in which low blood glucose levels stimulate its release.