DPP4 and sarcopenia: The discovery of BAPs can start by querying public and commercial databases of (i) WP-derived bioactive peptides (e.g., BIOPEP [192], AHTPDB [193], and milk bioactive peptide database (MBPDB) [194], just to mention a few), or (ii) pharmacological targets, such as metabolic enzymes (i.e., ACE, dipeptidyl peptidase-IV (DPP-IV), α-glucosidase), or (iii) markers of health and chronic diseases (i.e., cytokine levels, blood sugar, cholesterolemia, and sarcopenia).