Dr. Sonia Angell

NYC's Board of Health will now require chain restaurants to add salt warnings to dishes containing more than the recommended daily intake.

Salt is found on most dining tables and in most kitchens—but this ubiquitous household item has a long and curious history. It’s a flavor enhancer, an ice melter, has been used as a currency, and has shaped civilization. Mark Kurlansky, author of  Salt: A World History, and Dr. Sonia Angell, Director, Cardiovascular Disease Prevention and Control, New York City Health Department, explain what salt is, where it comes from, and discusses its influence on history and on our health.

Dr. Sonia Angell, director of New York City's cardiovascular disease prevention and control program, talks about the city's new trans fat regulation, which goes into full effect today. And Brian bravely conducts an on-air taste test between a trans-fat-free muffin--and one with the banned substance. Plus: How are restaurants coping? ...