How is an enzyme, pepsin, able to break down dietary fat in the stomach?me. i'm confused.

Protein is digested by the enzyme called pepsin. The stomach has naturally produced the enzyme. Pepsin is considered to be a digestive protease that breaks down dietary protein into simpler forms. Together with chymotrypsin and trypsin, pepsin is the main protein – digesting enzyme. Specifically, pepsin is most effective in breaking down the bonds of certain simple protein molecules like phenylalanine, tryptophan, and tyrosine.

Idont really understand