@katiecouric: Food Obsession

Why are we so obsessed with food?

On the latest edition of @katiecouric, "Fast Food Nation" author Eric Schlosser said it has "a great deal to do with the marketing."

"The marketers have changed the eating habits of American children, and we're seeing the consequences now, that those poor children are growing up often in poor health," Schlosser said.

Former FDA Commissioner Dr. David Kessler, author of "The End of Overeating" said "we're all wired."

"It's the fat, sugar, and the salt. They capture the brain circuits," Kessler said.

Millions of Americans eat when they're hungry, they eat when they're not hungry Kessler said.

"No one's ever explained to them how their brains, literally, have been hijacked."

Check out the full interview here.