...the question of portion size. When I ate Doritos or a Big Mac, I dept on eating and eating, and later experienced McRegret. So why when I ate a fourteen-week-old barred rock [heirloom breed chicken] or a grapefruit did I find it tremendously delicious and yet tremendously satisfying? If these foods tasted better, shouldn't I have just kept on gorging?Fred Provenza believes the difference comes down to what he calls "deep satiety." "Fundamentally," he told me, "eating too much is an inability to satiate." Wen food meets needs at "multiple levels," it provides a feeling of "completeness" and offers a satisfaction that's altogether different from being stuffed.

- Mark Schatzker