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.
Insulin is a peptide hormone that is produced by the pancreas and is used to control the level of glucose in in the blood. Glucose is a blood sugar that is introduced to the body by consuming carbohydrates. When glucose blood levels increase, insulin is then release from the pancreas into the blood stream.