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Two-thirds of Americans are overweight. And when many of them try to take off the extra pounds, their bodies fight to stay fat. Tara Parker-Pope, who described "The Fat Trap" in The New York Times Magazine, and Dr. Arthur Frank talk about why some people appear more biologically prone to obesity.

NPR.org will be posting live updates as the news comes in from Iowa. The caucuses start at 7 p.m. local time (8 p.m. ET).

The Bowl Championship Series climaxes Monday with a game in New Orleans between Louisiana State and Alabama. But should the winner really be called the national champion? Just think how other sports would look if they were run by the BCS.

In 2011, the Italian automaker introduced its first car for the U.S. market in 27 years, the Fiat 500. It opened new dealerships to sell only that model, but dealers had to manage without national advertising for months. And when an ad featuring Jennifer Lopez did finally come out, it was panned.

A major factor in the Syrian revolt is the battle between sectarian groups. The Assad family and the minority Alawites have held the top jobs for decades, and feel they would be trampled if the majority Sunni Muslims come to power. These sectarian tensions are never far from the surface in the Middle Eastern nations going through upheavals.

Having searched for a new CEO since Carol Bartz was fired in September, the Internet search and advertising company announced Wednesday that it has found one. Scott Thompson — most recently president of online payment giant PayPal, now part of eBay — will take over at Yahoo.

Dannon will air its spots alongside ever-present ads for Bud Light beer, as well as Doritos and Pepsi Cola. Companies are paying a record $3.5 million for 30 second spots this year. All the ad time is sold out.

In recent weeks a lot of polls and pundits said the Iowa caucuses might be too close to call. But nobody imagined just how close things would turn out Tuesday night in the first voting of the 2012 presidential nominating season. Mitt Romney was declared the winner by just eight votes. Former Pennsylvania Senator Rick Santorum came in second.

Linda Wertheimer talks to Carolyn Tallet, president of the Clinton County Republican Women's Club, and Edith Pfeffer, chair of the Clinton County Republican Central Committee, about the events leading up to the final tally of votes in the Iowa Republican caucuses.

The Iowa caucuses ended with Mitt Romney's extremely narrow victory over Rick Santorum early Wednesday morning. The first presidential nominating contest of 2012 played out at hundreds of sites across the state. And at the secondary school in Van Meter, voters were packed into the lunch room.