which bonds are broken when a protein denatures
A denatured protein is slightly different than both of these though. Denatured protein is also known as a whey hydrolyzed protein. When you hydrolyze a protein, what you're doing is basically changing the structure of the protein permanently. The peptide bonds that are present in protein are broken. However, despite the change in the structure of the protein, denatured protein still contains all of the amino acids that are found in other forms of whey protein. As a result, denatured proteins are still nutritionally beneficial.