People who made New Year’s resolutions to eat healthier or lose weight might also want to brush up on their math skills, according to Professor Donald Lichtenstein of the University of Colorado Boulder’s Leeds School of Business. In a study appearing in this month’s edition of the Journal of Marketing, Lichtenstein and his colleagues found that nutrition labels on packaged food products in the United States can lead even the most health-conscious consumers astray, if they don’t “do the math.”