* Enzymes are biological catalysts that speed up chemical reactions. In the context of food breakdown, enzymes specifically break down complex molecules into smaller, more usable forms, releasing energy in the process.

Let's look at the other options:

* Hormones are chemical messengers that regulate various bodily functions, but they don't directly break down food.

* Nucleic acids (DNA and RNA) carry genetic information and are not involved in the breakdown of food.

* Vitamins are essential nutrients that support various bodily functions, but they don't directly break down food.

In summary: Enzymes are the primary catalysts responsible for the breakdown of food and the release of energy.