The organelle that turns food into the type of energy that cells can use is the mitochondrion.

Here's why:

* Mitochondria are often called the "powerhouses" of the cell.

* They are responsible for cellular respiration, a process that breaks down glucose (sugar) from food in the presence of oxygen.

* This process releases energy in the form of ATP (adenosine triphosphate), which is the primary energy currency of cells.

So, while food provides the raw materials, mitochondria are the cellular factories that convert those materials into usable energy.