Co-authored by Nick Price
Take a look at nutritional labels from different foods and you will see %Daily Values for most of the nutrients, but rarely for protein. This is because the declared amount of protein in products needs to be adjusted for its ability to provide us with sufficient amino acids.
In general, the %DVs declared on nutritional labels can either involve simple math or be complicated. For example, a serving of fluid milk with 300 mg of calcium supplies 30% of its DV, while peanuts with 35 mg calcium provide 4% of its DV. Both use 1,000 mg/day as the Daily Value. For protein, you must also factor in how well it is used by our bodies. Fluid milk containing 8g protein in a serving supplies 16% of its DV; however, peanuts containing the same amount of protein in a serving supplies only 8% of its DV. PDCAAS is the way to measure the nutritional quality of a protein.