With CVS/Caremark quitting the tobacco habit at midnight Tuesday - a month earlier than its target date - and changing its name to CVS Health today to reflect its restated mission, president and CEO Larry Merlo has been out talking it up on the media-relations hustings.

A new study adds some lean muscle mass to the theory that a low-carb diet is more effective that a low-fat diet for losing weight and reducing the risk of heart disease.