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This Week: Digestion and Nutrition Next Week: Plants are Cool 5/2 Exam 3 4/27 bonus 3 4/30 homework 4 (12 pts max) During digestion complex molecules are broken down and then used to build needed molecules and to produce energy Food Pyramid based on 2,000 calories/day Protein needed per day = 0.8g/kg of body weight So a 150 lb person needs 54 g or 2 oz of protein/day CB 5.17 CB 41.10 8 Essential Amino Acids Eats many caterpillars Eats many leaves only a small percent of energy is stored in organism CB 54.10 CB 54.11 An idealized pyramid of net productivity 90% loss 90% loss 90% loss Human impact: As consumers CB 54.14 Use of agriculture in the U.S. About 1/2 of water and ~80% of agricultural land is used for raising animals. Fossil Fuels: Producing beef consumes about 145 times more fossil fuel than producing potatoes. The typical American could save almost as much gas by going vegetarian as by not driving. http://bicycleuniverse.info/transpo/beef.html The Calorie Restriction Society for people trying to live longer by eating fewer calories http://www.cbsnews.com/sto ries/2005/12/30/eveningnew s/main1172297.shtml Regulation of Drosophila Life Span by Olfaction and Food-Derived Odors S Libert, J Zwiener, X Chu, W VanVoorhies, G Roman, S Pletcher Science Vol. 315:1133 - 1137 23 February 2007 Smelling food reduces life span in CR flies Calorie Restricted Flies Normal Diet Flies Fig 1 Flies with a poor sense of smell live longer Or83b is a gene involved in the fly’s sense of smell Fig 2A Flies lacking the Or83b gene are resistant to starvation Fig 4B Smelling food reduces life span in CR flies Calorie Restricted Flies Normal Diet Flies Fig 1 This Week: Digestion and Nutrition Next Week: Plants are Cool 5/2 Exam 3 4/27 bonus 3 4/30 homework 4 (12 pts max) http://www.calorierestriction.org/ http://www.cbsnews.com/stories/2005/12/30/eveningnews/main1172297.shtml http://stke.sciencemag.org/cgi/content/full/sci;315/5815/1133 http://stke.sciencemag.org/cgi/content/full/sci;315/5812/584