In 2013, the Food and Agriculture Organization of the United Nations released a report recommending that a new evaluation methodology called the Digestible Indispensable Amino Acid Score (DIAAS) replace PDCAAS as the optimal approach to measuring protein quality, and according to consultant Cheatham, there’s debate about the pros and cons of the two approaches. “Among food scientists and nutrition scientists, there are some unanswered questions about which is the superior way and which way makes [the most] sense,” Cheatham notes.