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PPT : Ecology of Meat Diet vs. Vegetarian Diet
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* What do ecological principles tell us about availability of energy to humans?
o Pyramids Summarize food chains & Trophic levels
+ Numbers
+ Biomass
+ Energy
* Energy loss in food chains
* What do human do to increase available energy?
o Humans generally shorten food chains and make them simpler
+ Shorter food chains -
Affect of Feeding at Lower Trophic Levels
Could we support more humans if we fed at lower trophic levels (ate more plants and less animals)?
* How many vegetarians can be fed on land needed to support 1 person eating a meat base diet?
o Vegetarians (10-20)
* Acres needed to feed
o non-vegetarian (4 acres)
o vegetarian ( ½ acre or less)
Caveats with Plant Based Diets
* Let’s eat grass!
* What kind of plants can we eat?
o High in digestible carbohydrates (sugars and starches)
o Corn, wheat, rice , potato, sugarcane, cassava (manioc)
What concerns are there with plant based diets?
* Plants provide calories
* May lack essential amino acids
o Essential Amino acids 20-21
+ (9 or 10 we cannot synthesize)
* Plant protein
o Typically lack 1 or 2 essential AA’s
o Grains low in lysine
o Soybeans
+ high lysine
+ low in methionine
* Animal protein contains the essential AA’s
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Category : VegetarianSource : www.bio.ilstu.edu
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