Carb 2 : An informal unit equal to 1 gram of carbohydrate, commonly used in describing low-carbohydrate diets such as the Atkins diet. This newer usage of the term "carb" conflicts with the traditional use by diabetics (previous entry)
Russ Rowlett (Director), How Many? A Dictionary of Units of Measurement, Center for Mathematics and Science Education University of North Carolina, USA 2005. http://www.unc.edu/~rowlett/units/dictA.html, (Unit of Meas and Covr Factors - Amer) {608}