How much do we need?


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How much do we need?

  1. 1. “How much do we need?”<br />Nutrient and Dietary Intake<br />
  2. 2. Dietary Reference Intakes For Teenagers<br />Refer to the table provided<br />Highlight any observations you make that are particularly intriguing and/or surprising to you.<br />In your groups, compare and discuss your findings; be prepared to share with the larger group. <br />Note: You may want to refer to your notes from the previous unit on vitamins and nutrients.<br />
  3. 3. Think<br />Where are we going to get enough of these nutrients that we need everyday to sustain our health?<br />By eating foods as our source of energy and nutrients.<br />How much should we be eating in order to get these required nutrients?<br />We need to consume a certain number of calories in order to get the required nutrients.<br />
  4. 4. CALORIC INTAKE<br />Calorie: the amount of energy produced when food is oxidized or consumed by the body.<br />The number of calories your body needs varies based on a number of factors:<br />Activity level<br />Age<br />Weight<br />Height<br />Gender<br />Kcal = kilocalorie<br />1 food calorie<br />1000 energy calories<br />
  5. 5. CALORIES = ENERGY<br />The minimum amount of energy required to maintain basic life functions is referred to as the BASAL METABOLIC RATE (BMR).<br />Accounts for 60-70% of calories burned in a day and includes the energy required to keep the heart beating, the lungs breathing, eyelids blinking and body temperature stabilized<br />Higher in men than in women<br />Consuming too few calories will not allow for the basic BMR levels to be maintained; starvation and death will follow<br /> Consuming too many calories forces the body to store the excess as fat<br />
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  7. 7. A Few Things to Consider…<br />Obese and overweight people require a negative calorie balance  burn more calories that they consume<br />Caloric intake decreases as we age.<br />Carbohydrates and proteins provide 4 calories per gram.<br />Fat provides 9 calories per gram.<br />55% of calories should come from carbs.<br />12-15% of calories should come from proteins.<br />Less than 30% of calories should come from fat.<br />
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  11. 11. Nutrition-Related Deaths<br />54%  starvation, protein malnutrition<br />1%  iodine deficiency<br />5%  vitamin A deficiency<br />28%  iron deficiency, anemia<br />12%  other<br />
  12. 12. “How much do we need?”<br />Dietary Reference Intakes<br />
  13. 13. Everyone needs the same nutrients but not the same amounts.<br />Females need more iron than males<br />Active people need more of most nutrients than sedentary people<br />Seniors require less of many nutrients<br />Pregnant women require folic acid<br />
  14. 14. What is the D.R.I.?<br />Introduced in 1997, Dietary Reference Intakes helps North Americans stay healthy.<br />It is updated every 5 years.<br />Outlines the number of servings from each of the food groups recommended in order to consume appropriate amounts of each nutrient.<br />
  15. 15. What is the D.R.I. composed of?<br />Estimated Average Requirements (EAR)<br />Expected to meet the needs of 50% of the people in an age group<br />Recommended Dietary Allowances (RDA)<br />Nutrient-intake levels for 97-98% of people at each stage of life; 20% higher than EAR<br />Adequate Intake(AI)<br />Where there are is no RDA<br />Tolerable Upper-Intake Levels (UL)<br />Cautions against excessive intake of nutrients that can be harmful in large amounts<br />