What would happen if our bodies could not metabolize glucose

The correct answer is: we would lack the energy we need to function.

Explanation:

Glucose is a type of sugar that gives us energy. When we eat something that contains glucose, our body releases insulin, a hormone from our pancreas, which absorbs the excess glucose in the blood and stabilizes sugar levels. When insulin is released, it travels through the bloodstream to the body's cell. After that, the cells convert glucose into energy to use right then or store it for later use.

In other words, if our bodies could not metabolize glucose we would be hungry and exhausted because we would not get enough of the other nutrients (like proteins and fibers) to sustain our energy.