The energy in food molecules such as glucose is converted into ATP (adenosine triphosphate).

Here's a breakdown:

* Food molecules (like glucose) store chemical energy.

* Cellular respiration is the process that breaks down these food molecules to release the stored energy.

* ATP is a molecule that acts like a "cellular battery," storing and delivering energy for various cellular processes, such as muscle contraction, nerve impulse transmission, and protein synthesis.

So, in essence, the energy in food molecules is transformed into a usable form of energy (ATP) that cells can utilize.