The organelle involved in the conversion of food to ATP in eukaryotic cells is the mitochondria.

Here's why:

* Mitochondria are often called the "powerhouses" of the cell because they are responsible for cellular respiration, the process that breaks down glucose (a type of food) and converts its chemical energy into ATP.

* ATP (adenosine triphosphate) is the primary energy currency of cells. It's used to power many essential cellular processes, like muscle contraction, protein synthesis, and active transport.

While other organelles play a role in breaking down food, the mitochondria are the only ones that directly produce ATP.