How much of nutrients needed for healthly life?

I gave the glimpse of calorie and nutrition in the earlier posts. Here I would like to give inputs on other basic nutrition informations,DRI, RDA and AI which is being recommended by nutrition boards all over the world.

DRI, RDA, AI :

Dietary Reference Intakes (DRIs) comprise a set of reference values for specific nutrients, each category of which has special uses. The reference values, collectively called the Dietary Reference Intakes (DRIs), include the Estimated Average Requirement (EAR), Recommended Dietary Allowance (RDA), Adequate Intake (AI), and Tolerable Upper Intake Level (UL)

RDA ( Recommended Daily allowance) :

It is the average daily dietary nutrient intake level sufficient to meet the nutrient requirement of nearly all (97 to 98 percent) healthy individuals in a particular life stage and gender group.

The RDA are based on scientific knowledge and have been presented by a committee of the Food and Nutrition Board (FNB) of the National Academy of Sciences (NAS). RDA is generally accepted throughout the world as a valid source of information.

Adequate Intake (AI):

The recommended average daily intake level based on observed or experimentally determined approximations or estimates of nutrient intake by a group (or groups) of apparently healthy people that are assumed to be adequate—used when an RDA cannot be determined.

The following Chart gives details for Recommended intakes for Major nutrients.

The general guideline is that approximately 57%, 30%, 13% of energy should come from Carbohydrates, Fats and Protein respectively.