Researchers have found that people {and animals} presented with large portions will eat up to 30 percent more than they could otherwise. Human appetite, it turns out, is surprisingly elastic, which makes excellent evolutionary sense: It behooved our hunter gatherer ancestors to feast whenever the opportunity presented itself, allowing them to build up reserves of fat against future famine.
( Michael Pollan )
[ The Omnivore's Dilemma: A ]
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