Trans Fat Truth in Labeling Act of 2007 - Directs the Commissioner of Food and Drugs to promulgate a final regulation revising federal regulations applicable to the declaration of the trans fat content on a food label to require that if the trans fat content of a serving of a food is less than .5 grams and is declared in the nutrition information on the label or in the labeling of the food, such content shall be expressed through the use of an asterisk or other notation stating that such content is less than .5 grams (instead of zero).