wnyc.org / 93.9fm / am 820

The federal government has just released its updated dietary guidelines for 2005. Dr. Marion Nestle looks at how the government's recommendations about health and fitness have changed over the past five years. And we'll be taking listener calls about the revisions. Call 212-267-WNYC. Next, we'll find out how Stella Rimington, the former head of Britain’s MI5 Security Service, uses her years of intelligence work to lend credence to her first novel, the spy thriller At Risk. Finally, Simon Singh explores the origin of the universe in his latest work: Big Bang.