Today's is a best-of Brian Lehrer Show, so we won't be taking any calls. But the comments page is always open!
With New Year's resolutions starting today, we look at a popular personal promise: to get fit and lose weight. Writer A.J. Jacobs on his efforts to follow all health advice out there; nutritionist Marion Nestle on everything you need to know about calories; and what's behind the 20-minute workout. Plus: author Jim Holt examines existence; listeners give each other advice; lessons learned from television; and comedian Penn Jillette on atheism.