Ditch the RDAs*
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If this biochemical individuality is so well established, why do some sports medicine folk still flog one-size-fits-all nutrition, and the single-point figures of the Recommended Dietary Allowances (RDAs). Unfortunately, the RDAs have been so misused by medical professionals and the food industry as a standard for individual nutrition, that the error became nationally accepted and gave rise to numerous general recommendations on nutrition that are supposed to fit everyone. They fit no one, because the RDAs were never meant for individuals. The 1980 RDA handbook states prominently on page 1:

RDA are recommendations for the average dally amounts of nutrients that population groups should consume over a period of time. RDA should not be confused with requirements for a specific individual.

Dr A.E. Harper, former Chairman of the RDA Committee, emphasized this further by stating that RDAs "are not recommendations for the ideal diet." He went on that the term "recommended allowance" was adopted "to avoid any implication of finality or...optimal requirements". If you use the RDAs to plan your nutrition, you will never, never reach your athletic potential.

Lifestyle Dynamics

It would be easy to design individual nutrition programs if biochemical individuality alone determined your personal need for nutrients. Unfortunately, your lifestyle and environment radically affect your needs also. Nutritional requirements vary with lifestyle dynamics such as food quality, smoking, alcohol, pollution, medication, occupation, training, age, and a zillion other factors.

Training is a good example. Athletes who are on decent nutrition programs that keep them in top form at a particular training intensity, can quickly show evidence of physiological decline when they begin a more intense training program.

*from Micheal Colgan's "Optimum Sports Nutrition", ISBN 0-9624840-5-9, Advanced Research Press, New York, 1993