Why is glucose said to provide instant energy to the body?

Why is glucose said to provide instant energy to the body?

After we are exhausted, we take the glucose solution to regain the energy. Actually glucose is the smallest and simplest form of suger that can we easily absorbed in blood,hence providing energy to the body. Whereas the carbohydrates, when consumed, have to be digested into gulcose in order to produce energy. However, glucose when taken directly, need not to be digested. Hence its act as an instant source of energy.