Dietary Reference Values (DRV) give rough guidance for nutrient and energy requirements of healthy people. However, these values don't take into account exercises/workouts. The Scientific Advisory Committee on Nutrition (SACN) and the Committee on Medical Aspects of Food and Nutrition (COMA) published reports on estimated nutrient requirements.
The Recommended Daily Allowance (RDA) is a guideline based on minimal intakes to prevent disease rather than to give the best nutritional advise for a diet. The system has been superseded lots, this is due to the fact that the system is now viewed as very dated. There is a current system called the Recommended Daily Intake (RDI) though views are still the same regarding the use of the guidelines.
Children, pregnant/lactating women, elderly people and people with chronic disease conditions are more likely to encounter nutritional deficiency.
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