Carbohydrates are for "quick energy". If you have low glucose levels, your liver is going to detect this and your body will start to use up the glycogen reserves. Lipids contain more than twice the energy per gram than carbs, but they are referred to as "long term storage" and cannot be utilized right away.
There are two hormones that regulate blood glucose levels. One is insulin. This horemone "carries" glucose into the cell. No glucose and the cell starves and the glucose levels get higher in the blood. The second hormone takes glucose out of liver storage and increases the glucose in the blood. These two are a feedback mechanism that keeps the levels in a normal range.
The hormone Insulin regulates the body's glucose levels.
A glucose standard curve is a method of monitoring blood glucose over a period to identify patterns and peaks in glucose levels. Understanding regular glucose levels can help isolate medical conditions and promote the success of treatment plans. Glucose standard curves track the changes in glucose levels over time and map any spikes or lows in readings
insulin
The hormone that regulates blood glucose levels is insulin plus a second hormone, glucagon. Insulin lowers blood glucose levels and glucagon increases blood glucose levels. Insulin actually carries the glucose molecule across the cell membrane. That is how it actually lowers the glucose molecules in the blood. Glucagon causes the liver, which stores glycogen, to convert it to glucose which is released in the blood. These two hormones form a feedback mechanism which keeps glucose stable.
insulin
Maintain blood glucose levels within a homeostatic range
Drinking water after you exercise is a way to replenish your body's fluid levels. We had to replenish our stock of canned soup, so we went to the supermarket.
Glucagon is the hormone that raises blood glucose levels.
Glucagon is catabolic and increases blood glucose levels, insulin is anabolic decreases blood glucose levels.
Insulin
Cortisol release can increase blood glucose levels.
Insuline and Glucagon control blood glucose. Insuline: brings down high levels of glucose. Glucagon: brings glucose levels back to normal, (brings glucose levels up).
Fasting affects glucose levels by reducing below what might be considered normal levels. It is safe as long as blood glucose levels do not drop below around 60 milligrams.
Glucose levels are different for different times. There are 3 glucose tests that are given. One is a fasting test, where your glucose levels are tested after fasting. Normal fasting blood glucose level is less than 100 mg of glucose per dl of blood.
One can find blood glucose levels online at the website; Diabetes.org. There are plenty of other websites to help one out to find blood glucose levels.
Wikipedia has a good overall summery of what glucose levels are and how glucose works around your body. If you're looking for a simpler definition NHS choices explains why, how and what may cause high blood glucose levels and how it may be treated.