RDA is an acronym for Recommended Daily Allowance. Usually it is associated specifically with the USDA Recommended Daily Allowance, where the United States Department of Agriculture puts out a listing of what every human should consume on a daily basis for good health.
Most packaged food has a label designed by the USDA that explains the calories, sugars, fats, and sources of vitamins and minerals, plus a complete listing of all the ingredients of the foodstuff inside the package.
So, if you're having dinner with Spike Spiegel and Jet Black, you can complain when the bell peppers and beef is missing the beef.
Iron Noder 2017