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Chapter 2- A Balanced Diet

Chapter 2- A Balanced Diet - Chapter 2 A Balanced Diet An...

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Chapter 2: A Balanced Diet 19:08 An Ecological Perspective Supply of nutrients and energy often limits population size Harsh environments Support small populations Fertile environments Support large populations Human genes show some adaptation to shortages  Genetic adaptations made in the past are less useful now since our environment has  changed  Food has become more plentiful in the world  More problems with excess intakes, rather than deficiencies  Abundant intakes of fat, protein, calories and valuable nutrients  Planned diets are only possible when food is abundant  With abundance, we can make choices Nutritional Requirements  Essential nutrient         Must be present in the body for good health if your body could make it, you wouldn’t have to eat it Dietary Reference Intakes Dietary Reference Intakes (DRI) Gives specific recommendations for intake of each nutrient based on the body’s  physiological needs  Adequacy  Intake of a particular nutrient that ensures the highest level of physiological functioning Deficiency
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Intake of a particular nutrient that is insufficient to ensure physiological functioning.  Function declines Frank Deficiency If intake is much lower than the optimal range Toxicity Intake of a particular beyond what is needed to meet physiological needs, and high  enough to actually impair physiological functioning
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Chapter 2- A Balanced Diet - Chapter 2 A Balanced Diet An...

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