Yeah I kinda need vBux I guess

1) Excess glucose triggers the release of insulin by pancreas to decrease the level of glucose(or Grape Sugar) in the blood. The liver also helps to store this excess glucose in form glycogen. Later when the body will need sugar- it will eventually take the glycogen from the liver.
2) Since your body need's Sugar for Energy it will just use the stored glucose. Meaning that the glucose will lower down when the body starts using.
I hope this works and you can make it on you own words :3