David A. Kessler

“We've gone through some kind of a metamorphosis over the years. We've made food very easy to get calories from." He talked about the greater degree to which we refine foods now; an example is how we mill away the bran from brown rice and whole wheat flour. As a result the food is "light, it's white, it's very easy to swallow. It doesn't obstruct you in any way. It's easy to get a lot of calories without a lot of chewing."
Because this kind of food disappears down our throats so quickly after the first bite, it readily overrides the body's signals that should tell us "I'm full.”
― David A. Kessler, The End of Overeating: Taking Control of the Insatiable American Appetite