When glucose goes up in the blood, more insulin is also produced.
If there is more glucose in the blood than the body needs (for energy), elevated insulin levels signal the liver and muscles to store glucose in the form of glycogen.
Once the liver and muscles are filled to the brim with glycogen, the remaining glucose is converted to fat (triglycerides) and sent to the fat cells.
The liver and muscles are a kind of short term (limited) storage space for energy in the form of glycogen, and fat cells are long term (unlimited) storage space for energy in the form of triglycerides.
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