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Unformatted text preview: Diet and Evolution of Brain Size 21:50 I. Brains a. use 30% of the calories b. Brain=3 lbs c. Homo Habilis Starts eating animal food growing brain size c.i. Prior Plant food c.i.1. Lacked amino amino acids c.i.2. They were harder to digest c.i.3. Fewer calories c.ii. Australopithecus were plant eaters, small portion of their diets contained animal food. c.ii.1. 10% of chimps diet is animal foodtherefore they had a smaller brain c.iii. Shorter with large brain. d. Primates brain d.i. We have bigger brain compared to chimps and monkeys d.ii. How did we manage this? d.ii.1. Alteration of diet with high proportion of animal food d.ii.2. We matured much later than chimps (405 of their brain size is developed at birthby the age of 3 a chimps brain is completely developed) compared to us we have 7 to 8 years to develop our brain. Prolonger period of growth in human...
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- Winter '10