I discuss a public health case for modernizing the definition of protein quality. In 2019, Dr. David Katz and colleagues, including one of my favorite researchers, David Jenkins, published a “public health case for modernizing the definition of protein quality.” The prevailing definition seems to have more to do with biochemistry than the overall effects on human health. The common belief that protein is “good,” and the more the better, combined with a definition of protein quality that favors animal protein, gives the impression that eating more meat, eggs, and dairy is desirable and preferable...