Undenatured proteins: Is this really a valid concern?

Proteins, by definition, are undenatured. Denaturing is equivalent to digestion, which needs to take place when you consume them. Digested proteins are simply amino acids or peptides; not a bad thing to take. The hype over denatured proteins is unfounded in science. Even whey proteins, which have been pasteurized/cultured/dried before mechanical processing (filtration techniques) to concentrate the whey protein, are virtually undenatured because they contain intact immunoglobulins such as IgG.