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.
Hypoglycemia refers to blood sugar levels that drop below the normal range. When blood sugar becomes too low, the body releases a hormone called epinephrine (adrenaline), which causes the body to release stored sugar into the blood. Epinephrine produces symptoms such as hunger, sweating, and shaking.