Why do the Dietary Reference Intakes specify recommended nutrient and energy intakes for each life stage group?
Age-related physical changes seen within each stage of the life cycle affect body size and composition, which in turn impact nutrient and energy requirements. The Dietary Reference Intakes (DRIs) recommend specific nutrient and energy intakes for each life stage group in addition to additional needs seen in pregnancy and lactation so that nutrient and energy requirements can be met throughout life.
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Pearl is a distance runner, and wants to consume the most healthful diet possible for her health and performance. Her team nutritionist has given Pearl a goal of meeting but not exceeding the recommended AMDR for total energy from fat for athletes
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