The RDA (Recommended Dietary Allowance) and Nutrition.
Nutrition is the most important process that all living things must adhere to, and is where we draw the energy to maintain all bodily functions to sustain life. The standard of nutrition intake that is currently being followed to guide an individual to proper nutrition is called the RDA, or the recommended dietary (or sometimes, daily) allowance. It is a definitive chart that shows what certain foods and/or nutrients, and how much of it, should be consumed daily by a specific individual in order to maintain a healthy and balance nutrition.
The RDA (Recommended Dietary Allowance) was developed by Lydia J. Roberts, Hazel Stiebeling and Helen Mitchell during the World War II; Roberts, Stiebeling and Mitchell were part of a committee formed by the United States National Academy of Sciences to study the link between nutrition and the national defense, or if at all there is any. In 1941, the committee name was changed to, Food and Nutrition Board and after which started to develop recommendations as to the standard daily amount of each nutrient should be. These recommendations were primarily intended to the armed forces, civilians and other population groups who might need, or already have food rations. After a series of studying collected data and further developments with fixed allowances, Roberts, Stiebeling and Mitchell filed their findings for expert review, and hence on the same year (1941), the Recommended Daily Allowance was officially born. Since the RDA was initially conceived as part of the then existing Word War II, the recommendations stated in the RDA also included food availability. But since the official birth of the RDA, and over the past several years, the RDA have had numerous recommendations and changes made to suit the circumstances surrounding the time each recommendation and changes are proposed.
Current recommendations with the RDA are composed of, the EAR, Estimated Allowance Requirements, in expectation of the satisfaction of the needs of half of the people in a given age group as supported by scientific findings; the AI, Adequate Intake, outside RDA is an amount that is believed to be adequate, or sufficient for a certain group; and the UL, Tolerable Upper Intake Levels, a guide and mostly a precaution to warn the people against disproportionate intake of certain vitamins and nutrients, like Vitamin A, Vitamin E, and beta-carotene. With regards to names, the RDA, Recommended Dietary Allowance is also sometimes referred to as, Recommended Daily Allowance; it also had been known to be, the RDI or Reference Daily Intake, and more recently as the, DRI or Dietary Reference Intake.