World Food Programme (WFP) --WFP formerly provided a daily and annual emergency feeding nutritional requirements estimate for a hypothetical adult at 2100 Kcal/day including estimated requirements of calories, protein, fat, iron, iodine, zinc and eight vitamins. An unofficial conversion of the pdf file into a spreadsheet file (xls) can be downloaded here.
WFP, WHO, UNICEF, UNHCR-- A 57-page manual "Food and Nutrition Needs in Emergencies" can be downloaded as a pdf or printed from the following link http://whqlibdoc.who.int/hq/2004/a83743.pdf. It was prepared by WFP, WHO, UNICEF and UNHCR and contains tables showing nutritional requirements by age and sex as well as the nutritional content of selected food aid commodities. It alo provides examples of how to calculate emergency rations.
WHO-- WHO has a number of pages on its web site focusing on nutrition. They include specialized databases and documents. The home page is at http://www.who.int/nutrition/en/.
Many national governments or national nutritional councils guidelines for healthy diets recommending daily consumption levels of specific food groups. These usually including tables of nutritional targets for age and sex groups often with an accompanying graphic-- e.g. a food pyramid , a food plate, a food pagoda. A list of countries with links to the national nutritional guidelines is shown below--this list is undoubtedly not a complete one. Most of the links are to an FAO page linking to national guidelines at http://www.fao.org/nutrition/nutrition-education/food-dietary-guidelines/en/ shown as (FAO) on the page to conserve space. Links that are not based on the FAO list were found on-line -- a few are to articles describing a guideline when no suitable website could be found.