Dietary Reference Values (DRVs): Energy
Energy requirements are determined mainly by the Basal Metabolic Rate (BMR - the rate at which the body uses energy when it is at complete rest) and Physical Activity Levels (PAL - the ratio of overall daily energy use to the BMR - hence, multiplying BMR by PAL gives the daily energy requirement).

PALs range from 1.4 for a person with a job requiring little energy expenditure, and non-active leisure pursuits, to 1.9 for a man in energy demanding work with very active leisure pursuits.

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