Here's why:
* Simple sugar: Glucose is a simple sugar, meaning it's already in a readily usable form. It doesn't require extensive digestion like complex carbohydrates do.
* Directly absorbed: Glucose can be directly absorbed into the bloodstream from the small intestine.
* Primary fuel: It's the primary fuel source for many cells, especially brain cells, which rely heavily on glucose for energy.
While other nutrients like fats and proteins can be used for energy, they require more complex processing and take longer to break down. Glucose is readily available and easily converted into energy, making it the quickest source for the body.
