Today:

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Today Nutrition and Digestion Next
Week Circulation, Respiration,and Reproduction
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During digestion complex molecules are broken
down and then used to build needed molecules and
to produce energy
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Food Pyramid based on 2,000 calories/day
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Federal Food Subsidies vs Food Pyramid
http//www.pcrm.org/magazine/gm07autumn/health_por
k.html
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Protein needed per day 0.8g/kg of body
weight So a 150 lb person needs 54 g or 2 oz of
protein/day
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CB5.17
20 amino acids
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CB 41.10
8 Essential Amino Acids
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Many cultures combine these foods in their
traditional diets beans and rice, beans and
corn, peanut butter on bread, soy and rice,
lentils and bread or rice
CB 41.10
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The Calorie Restriction Society for people trying
to live longer by eating fewer calories
http//youtube.com/watch?vYTQR7o9ap9Y
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Regulation of Drosophila Life Span by Olfaction
and Food-Derived Odors S Libert, J Zwiener, X
Chu, W VanVoorhies, G Roman, S PletcherScience
Vol. 3151133 - 113723 February 2007
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Smelling food reduces life span in CR flies
Normal Diet Flies
Calorie Restricted Flies
Fig 1
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Flies with a poor sense of smell live longer
Or83b is a gene involved in the flys sense of
smell
Fig 2A
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Flies lacking the Or83b gene are resistant to
starvation
Fig 4B
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Smelling food reduces life span in CR flies
Normal Diet Flies
Calorie Restricted Flies
Fig 1
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Calorie Restriction related websites
http//www.calorierestriction.org/ http//www.cbs
news.com/stories/2005/12/30/eveningnews/main117229
7.shtml http//stke.sciencemag.org/cgi/content/fu
ll/sci315/5815/1133 http//stke.sciencemag.org/c
gi/content/full/sci315/5812/584
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Cause-Specific Excess Deaths Associated with
Underweight, Overweight, and Obesity Flegal KM et
al JAMA, November 7, 2007Vol 298, No. 17 pg
2028-37 Overweight (BMI 25-30) people live
longer than normal (BMI 18.5-25), underweight
(BMIlt18.5), or obese (BMIgt30) people
JAMA, November 7, 2007Vol 298, No. 17 pg 2028-37
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Overweight people live longer than normal,
underweight, or obese people for all causes of
death
CVD cardiovascular disease
JAMA, November 7, 2007Vol 298, No. 17 pg 2028-37
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JAMA, November 7, 2007 Vol 298 2028-37
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The Digestive System
CB 41.15
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(No Transcript)
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light
Photosynthesis
CO2 H2O
C6H1206 O2
sugar
Cellular Respiration
CO2 H2O
C6H1206 O2
sugar
energy
ADP
ATP
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Cells store energy in ATP
Energy released
Energy used
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Using ATP
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Complex molecules are broken down and then used
to build needed molecules and to produce energy
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Animals take in complex molecules from the
environment for energy production
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Animal digestion occurs outside of our cells.
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animal and fungal digestion occurs outside of
our cells.
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Physical digestion liquefying of food Chemical
digestion breaking large molecules into small
molecules
CB 41.21