Summary
The Food Nutrition Board of the National Research Council estab-
lishes Recommended Dietary Allowances and Dietary References
Intakes. These guidelines provide daily nutrient levels for main-
taining normal functions and health. The RDA lists recommenda-
tions for energy; protein; vitamins A. E K. C and the B vitamins
and the minerals iron, zinc, iodine and selenium. These recom-
mendations vary according to age, gender, pregnancy, and lactation.
Protein requirements for humans should consider the essential
amino acids. The food pyramid provided by the FDA is easy for the
average person to follow to ensure adequate nutrition.
The digestive process includes ingestion, digestion, absorption
and elimination. Nutrients in the diet are progressively broken into
smaller components by mechanical, chemical, and enzymatic
means. Small molecules resulting from digestion are absorbed to
supply the body with energy, protein, vitamins, and minerals
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