1 / 8

30.2 Food and Nutrition

30.2 Food and Nutrition. Food and Energy Energy: Cells use chemical NRG in food to make ATP (cell fuel) ATP powers cell activities Measure food NRG by burning: 1 calorie = heat needed to raise 1 gm H 2 O 1 ◦ C 1000 c alories = 1 kilocalorie or 1 dietary C alorie

octavious
Télécharger la présentation

30.2 Food and Nutrition

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 30.2 Food and Nutrition Food and Energy Energy: Cells use chemical NRG in food to make ATP (cell fuel) ATP powers cell activities Measure food NRG by burning: 1 calorie = heat needed to raise 1 gm H2O 1 ◦C 1000 calories = 1 kilocalorie or 1 dietary Calorie Raw Materials: substances body needs (but can’t manufacture) to build/repair body tissues

  2. Nutrients • Water: most important • Cells need for proper chemical function • Dehydration: water loss greater than intake • Drink 1 liter fluids each day • Carbohydrates: • Main NRG source • Simple/complex carbs converted to glucose • Cells metabolize to ATP for cell work • Glycogen: excess sugar stored in liver or converted to fat • Cellulose: plant fiber helps clean Dig. Sys

  3. Fats/Lipids Help absorb fat-soluble vitamins In cell membranes, nerves, hormones Protect/insulate Energy storage Polyunsaturated (more than one double bond) Trans fats: manufactures add H; solid at room temp; longer shelf life Linked to heart disease

  4. Proteins: Raw materials for growth/repair of body structures Enzymes speed up body chemical reactions Hormones: insulin regulates body sugar Hemoglobins carries O2 in RBC”S

  5. E. Amino Acids: make up proteins 8 essential AA: needed in diet F. Vitamins: need small doses; organic tools to build body components G. Minerals: inorganic nutrient molecules like Ca (bone health) and Fe (blood health)

  6. Nutrition and Balanced Diet Balanced Diet: adequate nutrients and energy molecules to maintain health weight Food labels: nutrition information Fat: 9 C/gram (C-H bonds: harder to break releasing more energy) Carb/Protein: 4 C/gram % Daily Value/2000 cal. Diet Age, gender, lifestyle affect need

  7. Healthful Weight Obesity: influenced by inactivity; high calorie diet

  8. Physical activity: burns excess calories; strengthens heart, bones, muscles Amer. Heart Association: Diet w/30% Fat Max 7% Saturated; 1% trans fats Hi levels increase risk of heart disease & type II diabetes

More Related